I said it before, but I've never been one to shy away from redundancy and repeating myself...
Part of me really suspects that this was intentional, to get himself back in the news. He'll check into rehab, clean up, and re-emerge with his tail between his legs and a new three-picture movie deal.
SWMBO thinks he may have dropped the N* bomb unintentionally at the onset, then felt that he had to run with it in an Andy Kaufman-esque way, to play it off like he was a racist character (but not himself a racist). He had to take it to the absolute extreme so that he could play it off as a joke later, but that he failed. I'm not buying it.