CM Punk, most of the time, is a complete jerk. At least on camera, I've no idea how he is in real life, but from what I've seen in other things not dealing with his persona CM Punk, Phil Brooks is a pretty decent guy.
I think he was in the right when he said what he did about Chris Brown, he didn't do it in a disrespectful way, so I've got to stand with CMP on this one. That's just my two cents worth, and as Oniya said, Brown must not watch much wrestling or he'd know that CMP is Straight Edge. (For those that don't know, this means no drinking, smoking, drugs, performance enhancers, anything of that nature.) And as far as we all know, Punk lives the lifestyle he claims he does, just don't let the tattoos throw you off lol. =)