I've recently had some growing hatred for when people say "I feel like" instead of "I think."
ex: "I feel like the Pavement shows were'nt as good as people said they were." "I feel like their earlier stuff was much better."
also when people say "I don't know what that is" when someone is talking about something, instead of simply asking what it is. Saying "I don't know what that is" is totally useless and a waste of time. It's worse when they follow it with "sorry."
Both are very petty, but damn, they get my goat!