I can't stand popups especially on mobile and sites that block me when using uBlock - typically I block the ads because they are horrible ads and there are too many of them.

Apologies for the rant, but then, your question was literally asking for it.

#1 Material/Metro/Modern/flavor-of-the-month-design-paradigm that encourages bright contrasting colors in close proximity.

This is one of the biggest turn offs. In the good old days people used colours with caution, spent thought on consistency and minimalism.

Apple used to be gold standard of interface design. I adored the minimalism of Github, Quora and Stackoverflow.

But as luck would have it, the world has now been overrun by insanity:

#2 Flashy/pointless/misleading adverts

Volumes have been written about this. You have seen it, you have loathed it, you know what I am talking about.

#3 Disregard for hyperlinking

Ember authors have hit the nail in the head:

However, it's important to remember what makes the web special. Many people think that something is a web application because it uses technologies like HTML, CSS and JavaScript. In reality, these are just implementation details.

The web derives its power from the ability to bookmark and share URLs. URLs are the key feature that give web applications superior shareability and collaboration. Today, most JavaScript frameworks treat the URL as an afterthought, instead of the primary reason for the web's success.

Despite being widely known as a best practice, it is all too common to come across a state that you can't favourite or share by just copying the url.

Even more irritating is when sites decide to go through a massive overhaul and older links get redirected to home page or some generic top level page with no details about the context it was linked from. It is disheartening to see massively popular sites like AppAnnie do this.

#4 Technology blogs with no consideration towards obsolescence

A blog post dealing with technology, with no information about when it was published, and what versions of libraries it deals with can make things very confusing.

Though proliferation of tools like Jekyll have mitigated this significantly by making it a best practice to embed the publication date in the url itself, I still occasionally come across posts with no information as to what era it was written in.

#5 Opaque moderation

I do not have a problem with moderation as such - if the owners of a platform believe that to retain the focus of a community they need to block certain content - it's their choice. But I have been part of communities where you would not know at all if your content was muted and/or hidden from public view.

This is where you cross the line from good will over to treachery.

#6 Deceptive "Growth Hacking"

Warning emoji in spammy marketing mail subjects, RE: and FWD: prefixes, click bait titles ... the list goes on and on.

I rage quit websites when they put nasty tasks on me. Task such as filling a long form with super weird 'validation' rules or losing filled fields when accidentally reloading or even worse losing filled fields when I took too much time to fill and my session expired.

I fight back websites which disable the right click context menu and use plugins which overwrite such stupid nonsense or simply never come back (I'm looking at you Google Docs). Selecting text and look up for its definition or query a search of text is essential to me. On some table based websites, I need to copy entire columns but not the whole table.

My biggest point here on the list is about that false security mechanism called security questions. When I've lost my password and some silly security questions asking me about my dad's first pet name or when my mother first time kissed my father - to justify that I am I. I could handle such stupid false shitty behaviors if I could define the question by myself. But more and more websites took that decision away from me and forced me to answer predefined easy to social engineer questions. I feel more and more site helping the NSA. With easy security questions, no one needs to crack encrypted connections or passwords. Just lookup some Facebook pages or other social media and you know pretty much anything about anyone's secret questions/answers.

A body click function that no matter where you click it opens up pop ups or new tabs of ads I hate that. Also reseting that same function every 3 or 5 seconds. Everyone should try to change ads and make them first of all real and not look like virus so everyone can stop using adblock

hmm one thing i ran into today was a shop system.

they mixed prepaid payments with postpaid payments. or in other words -> if you want to use a voucher you need to fill in your credit card.

But everything you do not "use" will remain on your "account" but you can not use it unless you use your credit card ....

Hate those things they make me so mad... because obviously they implemented it just half-ass and that is something I hate even more ... checklist like programming ... now I have a voucher and still need a credit card ... this is just plain stupid ...

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I always was of the opinion it was a neat trick for lazy developers to limit traffic on mobile devices. But you are right, it is also very annoying and especially on a big site like TheVerge, they could have come up with better ideas...

Well, as for things I hate: Here in Germany we have a pseudo-tech site which always loads a banner to buy their premium after loading the real content. It is big, it is ugly, it is nearly neon green, and I can only see the topmost article and have to scroll down for more. The problem: Since it loads the banner later, the whole content just jumps away, which is very bad (we had some link for this anti-pattern here a few days ago). I cannot even block it. If I block that ad, they block the whole site for me :( So it is a mix of many annoying things in just one single banner. I really don't know, why I still frequent that site, since the articles are lacking, sometimes incorrect and lately even have improper language and offenses in them... Maybe just an old habit.

Other annoying behaviors include overriding of browser functionality (as seen here on Hashnode with middle-mouse-click; already told the team about it and they are working on it, so thank you!). I am used to certain behavior and if a site changes what I am accustomed to, the site feels a lot more annoying to use because I have to rethink my actions to achieve the behavior I actually want.

Overload of images, like on TheVerge. The mosaics look nice from a distance, but they make scanning the articles a pain. Unfortunately I have seen a few more news sites which use mosaic layouts with picturtures for news articles.

White background at night. 99.9999% of the websites do this wrong. It hurts my eyes when browsing, so I consider it very annoying. I use the Stylish plugin to darken sites I use regularly (like Google), but when opening another site, it really stings :(

Modal windows that automatically pop up. The worst is if I'm on an ecommerce site and they force me to sign up before I can look at the product I'm interested in. It also drives me bananas if I'm engrossed in reading an article and a modal pops up asking me if I want to sign up for their newsletter. It's even more frustrating on mobile because they're typically not responsive, so it's hard to get them to go away.

Asking me to turn off Adblocker! I'm not complaining, but it's like IN-THE-FACE. If they ask me politely, I might have done that, but blocking the page just for that! I stopped using lot of sites because of this. It is a big downer for me, like if a girl eat garlic before we kiss! Ugh!!!!