I don't like it when people get off or on the elevator and just stand in front of it deciding which way to go. Others want on or off too.
I don't like waiting for appointments, people who always run late, etc. I'm on time and you should be too. I do make exceptions for those who had an emergency situation.
I have to laugh though. My in-laws were always 30-50 minutes late. I always told them things started 1 hour earlier than they did.
It drives me nuts when people get on a highway or interstate and assume they have the right of way and don't bother to look to see if cars are in the lane. Merging is a lost art.