Manners.
Don't even get me started. I'm all for being polite, but table manners are ridiculous, "no you're holding your ____ wrong, you have to do it like this"  then there's tone of voice. I CAN'T DO THAT!!!! People always think I'm being rude based on my tone, and it sounds completely normal to me, then they say "you don't have to be rude" and then I get angry. And then they say I'm being even more rude so I'm just here like "you're not welcome right now get your ****, and get the **** out of here before I kick your *** to the curb." Which I don't actually say but I want to.

Formalities.
Online formalities are the WORST! I always sound too formal! It's probably because of language arts, and the whole "don't use said, use proper grammar, use complex words" it makes it hard. I don't fit in with my generation... *sinks into seat* the internet is my sanctuary...