Did you see Michael Richards going nuts like a crazed racist? That's f'd up. One may argue that some one in the crowd made some racial comment toward him first (since we can't see all of the video), but honestly, that's no excuse. He's the performer, and he's the one bearing responsibility.
I watched part of Comic Relief the other night. Why is so much of "comedy" based on race jokes? So much of it reinforces stereotypes instead of helping them. The funny thing is, the hottest comics right now don't go for the "easy" race jokes. Dane Cook, Rita Rudner and the like, don't do it. I much prefer the dick and fart jokes, you know?