Are you saying he's not allowed to have, and express, the opinion that you're immature?
I mean, there's no real evidence that you're immature (one comment in a stupid sports thread really isn't enough to make that judgement, but whatever- that's just my opinion), just like you have no real proof that Bryant's accuser was actually raped (she was, if you recall, presented with the opportunity to see her alleged assailant punished in some way that would be more significant than some cash payout, yet she opted not to seek "justice").
Almost anyone, however, can hit Google and find actual photographic and video evidence of [Invalid or Expired Link Removed] while they're laying on the floor, or [Invalid or Expired Link Removed], or of
Bowen kneeing Nash in the groin, or of
Bowen intentionally kicking Amare Stoudamire in the back of his ankle as Stoudamire goes up for a dunk, or of
Bowen kicking Wally Szczerbiak in the face as Szczerbiak is going up for a jump shot, or of
Bowen kicking Ray Allen in the back. It's real evidence of real dirty play, and I don't see how it's anything but indefensible.