I just caught it yesterday. Basically, he wrote a piece that was clearly intended to be satirical, but missed the mark by too wide a margin. It came off as crude and ugly (some would even say racist).
He tried to imitate black vernacular, or "Ebonics", which really wasn't the worst of it. It was that it was too hard to see at a glance that he was trying to show how racist the NAACP is. It just came out all wrong, and did more harm than good.
Personally, I thought he should have come out the next day with some kind of statement to explain himself.
I dunno. It's just one of those unfortunate bits of ugly business.
Poat some links if you have them so that we can see the alleged offensiveness. TIA.