Pedantry, without a doubt!
i think its "Arrogance/self righteousness"
Pettyness for me definately.
Would have to be a few off of there..
Lack of a sense of humour - That serously sucks...
Pretentiousness - either snobbish, shallow aspirations and attitudes or silly conforming behaviour to play a part while ignoring the best of their character. It grinds my gears to see how many teenagers feel they have to make a statement about themselves and their angst...it's the most boring thing in the world.
Emo's piss me off, yes I was an angst ridden teenager, no I did not self harm to bring attention to myself, it must be soooooooo hard living in a wealthy nation and owning more now than an African will ever own in seven generations, stuff is sooooooooooo hard for you, diddums. As you say that sort of thing can be self indulgent and pretentious.
Intolerance pisses me off. I hate it when people think that their lifestyle is the correct lifestyle.
Intolerance in general. People should at least tolerate other beliefs/interests etc, even if it goes against their own beliefs.