Here is my take.
Newton is one helluva athlete and quarterback. All his life he's played for that moment. He lost the biggest game he's ever played in.
Was he disappointed? You betcha.
Was he upset? You betcha.
The year he had makes me wish I'd have taken him in fantasy football, but, no one can foresee what kind of season anyone would have.
That said. He should have taken some time to collect himself, yell in the locker room, kick the bench, do what he needed to do to get the steam out, THEN go talk to the press. The press would have waited. Collect himself and just say "On this day, Denver was better. they had me bottled up and i give them all the credit in the world". (or something to that effect).
It was wrong of him to just walk out. He owed HIS FANS an explanation at that press conference. You know, the ones who supported him all season.
And by the way, he happens to be an NFL quarterback who is black, NOT a black quarterback. In my mind, there's a big difference.
I don't see color in anyone. They're either a nice person worthy of respect, or they aren't, period.