I don't know what competence has to do with sexism. Wouldn't you ask your boss if she was a male?
Why would you? I mean, I don't know every background information, what the developer is doing, what kind of malware it is, and such things.
But for example, i am a Web or Full Stack Developer, how should i know how to remove some kind of bad program? Where should i take the knowledge from, when even google can't help me with my problem?
Only because I can bring a led to glow doesn't mean i am able to fix the lights of a football stadium.