I'm gonna agree with Andrew on this one. I hate the fact that people who are confident are often labelled as cocky or arrogant. There's a difference between believing in yourself and thinking that your shit doesn't stink. Extreme confidence is cockiness, and that's not cool.

Also, I'm all for people having self esteem, but I hate it when people are overly confident, or talk themselves up a lot, and then suck. This happens in sports a lot, when kids talk shit or say how good they were "back in high school", get picked first and then just shit the bed.