what is one thing you dislike

[Delphyne]

I dislike ignorance.

Worse than that, I dislike those people who willfully choose to be ignorant. 

[demaina]

Oh man, one thing.... hmmm.

I think I have to go along with the original posters as far as I really get annoyed by people who think they are better than you.  Obviously I'm not perfect and don't know everything, but it's still frustrating if someone treats me like an idiot.