I can only think of a few cuz I'm mad tired, but...
-- People who speak ill of the dead. I'm sorry you had beef, but damn, HAVE SOME RESPECT.
-- Any grammatical errors that should've been fixed by the 2nd grade...I'm sorry people, but how hard is it?? Just about EVERYBODY where I work says "Flustrated"... Yes, flustrated - - like a cross between flustered and frustrated. BAH!!!
-- People that are in college that look at you like
when you use a word that may not be in everyone's everyday vocabulary...Why is it that stupid people are always like 'Wow, is that your big word for the day??' Mofo, you're in COLLEGE...tell me again how you got here??
I can't believe no one has said this yet...
-- People that always have a better story than you. IE - Anything you can do I can do better....Anything...Anything that happens to you has happen to them, squared. ARG.