It's amazing how some of you (VF21, cough, cough, Bricklayer, cough, cough) have huge blinders on. It's very obvious if you follow DMC and the team that he is, in fact, a bully. You see it on the court when he sizes up the little dudes. We've seen it with coaches, teammates, media, and now allegedly everyday people in a bar. I've personally seen him in a shoot around when he was being an a-hole about little kids shooting on the court because he wanted to warm up on that side of the court (the little kids had a scheduled session to go out and shoot for 5 minutes). Like others have said, he's just an angry person.
It's really just a matter of him making a choice to grow up, but I still think he's a long way away from it. Take tonight's game for example. He picks up his 6th foul on a stupid play by pulling the jersey of his opponent when the referee is standing directly behind him. Then when he goes to the bench, he's laughing with a teammate (while trying to hide it by putting his jersey over his mouth) while the Kings start pissing away the lead and it comes down to the last possession. Do you think Larry Bird, Magic Johnson, MJ, Karl Malone, etc. would ever act like that after fouling out of a game? They certainly wouldn't foul out in that manner to begin with but this really comes down to maturity and, unfortunately, DeMarcus still doesn't have any of it.