Cocky people ~ If you have amazing talent or abilities, chances are others know and already respect you for it.
Abnoxious/Ignorant people ~ GRR these people drive me nuts. At lunch there's this group of weird kids who sometimes sit at my table. They yell, spit food, put their hands/feet on your "area" of the table, and are just generally rude.
Rude and unfriendly people ~ I understand that people have hard days, but if you aren't open to people, why would anyone be nice to you Some of these people need to lighten up .
Unsanitary people ~ This one plays a big factor, as many of us play Pokemon TCG. If you can't afford to take a frikin shower you shouldn't be wasting your time and money on a game.
People who try to cause trouble ~ All though enjoy my fair share of mischeif and such, people who have intentions to do bad stuff that could affect ones life seriously have no respect or dignity in my opinion.