His comments were about the media and their race-pimping. He disagreed with the media hyping, who was it?, Donovan McNabb (I think) as being some messianic quarterback and said that he doubts the media would have been so keen on McNabb had he not been black.
That doesn't make him a racists. That makes him alleging the media is racist. Which, in that case, may or may not be true -- it would depend on whether or not you believed they were hyping McNabb because he was black or because he was the greatest thing since sliced bread -- which, if you recall, was exactly how the media treated him leading up to Limbaugh's comments.
Frankly, McNabb proved to be as mediocre as Limbaugh thought him to be. Not because he's black but because he's mediocre.
Limbaugh-haters took the opportunity to mischaracterize his words and turn it into a racial issue. I'll give 'em this, they were successful.
It goes back to what I said in that other thread. If you say anything negative about a black person, you're a racist.
Now, if Rush Limbaugh had said McNabb was an inferior quarterback because he was black, you'd have a point.