It really upsets me when people play a double agent in their own life. You have a conversation with them, they go on and on about something/someone, and it takes most of what I have to not scream at them, "Are you serious?! You do the SAME thing! You aren't some god who knows more than the rest of us!"
Pride, narcissism, and bitterness in people anger me to the point I will disengage from the person.