I don't like people who are perpetually late for work, meetings, etc. I get highly annoyed of someone pointing their finger in my face. Quick way to leave with a broken finger. I too get aggravated with those people that hit their brakes every 2 minutes for no reason. I also hate someone driving 60 in the passing lane and doesn't bother to et over until you've had enough and go to pass them on the right. Had a mini-van do that to me yesterday and I ended up having to go off on the shoulder to avoid him hitting me. He drove in the passing lane for over two miles keeping pace with the car beside him and when the car got off at the exit he proceeded to stay in the lane. I signaled and got over to pass and when I'm a 1/4 of the way by him he begins to come right over forcing me onto the shoulder.
I also get aggravated at lazy people at work who try to pawn their work off on someone else and then play on their phones or CPU all day.
End rant..