People should be free to choose what they watch or don't watch, period. That being said, it's hard to believe that such a seemingly intelligent and articulate guy would put everything at risk with such a poor choice of words. From what he said though, "Exactly how you describe black people acting..." it sounded like he was calling out racist whites and using the N word towards them to highlight their hypocrisy. Bad idea. That word from a white mouth causes temporary deafness to everything else. Adding "And you guys can't even act like white people," made it sound even more like he was being racist. But again, he might have chosen those words because those are the words he's heard racist whites use, and was using them because he thought they would be super insulting and have maximum impact.
Still, bad choice.
Yes. I've heard him say a few times he likes to use words that shock people. I doubt he's really racist, but even if we assumed the worst, I think people blow these things out of proportion. I think many of us had grandparents who said things like this. I don't condone it, but I don't think ostracising people is going to help much either.