Difference of opinion. It's not part of his job. There have been numerous discussions over the years about changing how the media interacts with players. Marshawn Lynch made an entire career of ignoring questions from the media. Literally, AN ENTIRE CAREER. Did you have the same response?
The key point that you said is "you don't care" that Broncos could be heard behind him. Guess what? Your opinion and what you care about doesn't matter one iota. He didn't get fined. He was ON THE STAGE ready to answer questions. The fact that in the biggest stage in the biggest game in the biggest sport in the free world they couldn't separate two teams in a 71,000 seat stadium far enough so that the losing team didn't have to hear the winning team gloating and celebrating from the other side of a curtain is totally absurd and falls squarely on the shoulders of the NFL. Cam Newton walking off was exactly what they deserved and they should learn a lesson from it.
I'm assuming you think this all means Cam is a sore loser, or unprofessional for the franchise? Look no further than this quote from Peyton Manning, regarding a Cam Newton who approached him on the field after the game with a smile on his face, to see how wrong you are.
“Cam could not have been nicer to me. He was extremely humble. He congratulated me, wished me the best. I told him congratulations on his outstanding season and what a great future he has ahead of him. He’ll be back in that game, I can promise you. I have been on that side of it. It is tough. It’s not an easy pill to swallow. He was very nice to me, and I really appreciated that,” Manning said.
We wouldn't be having this conversation if the league golden boys Peyton Manning or Tom Brady did this. We wouldn't even be having this conversation if Russel Wilson did it. But because it's a polarizing entertainer like Cam Newton who just dissected an entire league worth of defenses in maybe the most impressive athletic display in league history to the tune of 15-1, and let everyone know about it along the way---we're talking about it. It's utterly absurd and at this point anyone still harping on it is someone I imagine I wouldn't want to spend much time around in my personal life.
The fact of the matter is that I live in Charlotte and I hear daily about the good that man does for the community, for kids, and for philanthropy. That makes the man; using your celebrity for good. And in that regard, he's arguably the best in the league.
But hey...keep complaining about your 2 1/2 minutes of missing post game interview. "Real solid argument you have there."