You know what really grinds my gears? When people do things that they recognize is more complicated and do it anyways.
Example: Me writing a MATLAB script, I use "!=" to mean "not equals", like every other programming language out there. It puts a red squiggly under that telling me it is wrong. I mouse over it and it says "In MATLAB, Not equals is represented by '~='" Really? You recognize what I'm trying to do, even took the time to code a tip telling me I was wrong. Why not just use the standard most other languages use? Ugh