Bubblegum. Double peeve on people who play with their gum (fucking dis-fucking-scusting).
People who see me sketching and assume that means I want to talk to them, or that I'm sensitive, or some shit.
Popping in in the middle of a discussion to deliver some asinine miscarriage of a comment without feeling the need to know anything about the relevant topic.
Incorrect assumptions about anything without any solid basis declared as if indisputable fact to the world, for that matter.
Animals who can't shut the fuck up when I'm trying to sleep (including human animals).
The glorification of ignorance ("I don't know nuthin' bout that" as if to imply there's something wrong with a person who does).
Political abstinence from a position of moral superiority (Plain admittance that you don't know anything about the subject and thus aren't qualified to vote is fine).
Blind faith (informed faith is fine, "Reverend Pat said it's right in the bible and he wouldn't lie to me" is retarded).
Grammer. It's grammAr. When I read statements like, "please use good grammer" I want to slap someone. Anyone.
Oh man could I go on...