I try to cover HTML/CSS as much as I elegantly can in JS.
I hate using other people's work unless I know theirs are much better in the context that matters to the situation
I didn't wanted to fully learn jQuery at one point so I made my own library that did more than that and keep on adding stuff "already-out-there" to the current framework version
I despise Windows/OSX and people who only use GUI(100%) + mouse compared to Linux coders like me who use CLI most of the time and barely use the trackpad (I don't use any mouses although I own one).
I prefer AZERTY FR keyboard layouts to QWERTY GB keyboard layouts although 90%+ people I know in the UK use those
When I see code written by other people (online, in lectures, ...) which doesn't fit my coding style or close ones like Google/Standard's I have the imediate urge to refactor it to my coding style so that I can read it clearly without being "Eww, this code is horrible" or "Huh WTF!!". I'm generally relax on that but it's at the peek when I see inconsistent styling in the same code
I would always discard old environments/systems/softwares that are outdated (even if still used by a fair amount of people) when building/testing something.