1) Goody two shoes people, you know these kinda of people, all work no play, 3.99 GPA, they study ahead of the teacher, they only talk about studies. they act as if getting high grades and a high paying job is everything life is about.they make me feel bad or less than them all the time
2)people who talk about friends behind their backs, I don't mind talking about random people behind their backs, I mean the teacher that gave you a low grade or that guy at uni that wears the same shirt everyday. But when I see someone talking about a person he/she is friends with and smiles at all the time, I feel back stabbed myself. you can be sure that a person who talks about his friends behind their backs to you, is or will be talking about you behind your backs in the same icky way
3) people who only call or IM on messenger when they need you
that is all I can think of for now