Like the bumper sticker says: mean people suck.
Mean people really get on my last nerve. People who are rude, nasty, messy, or just plain mean... I don't care whether they're Christian or not. I just can't stand mean people. I don't see how people can say something mean or rude or hurtful and not lose sleep over it, or even flinch. That bugs me.
People with no integrity also get on my second-to-last nerve. I dislike it when folks can do wrong and not even bat an eye...
People who take advantage of others' weakness gets on my nerves, either by teasing, mocking, or ridiculing the "underdog;" or by kicking a person when they're down, or abusing their authority (i.e. police, pastors, teachers, supervisors, and other folks in positions of authority who mistreat their subordinates).
People who think that they make themselves look better (or smarter, or more attractive, or wealthier) by pointing out the flaws of those who may not be as smart or good looking or wealthy or whatever.
Dreamers... people who always talk about big goals but never do a darn thing to make them happen. And then get mad when you're not all impressed by their big talk... LOL