Same with the Simpsons Michael Jackson episode, 30 Rock and It's Always Sunny also had black face jokes that ironically were meant to make the viewer feel extremely uncomfortable and realize how racist the character was being that are now gone.

Whether you agree with the jokes/premise or not, I believe we shouldn't pretend like none of that happened. To me that makes it worse. The fact that we feel so uncomfortable with it now proves that we are marching forward, and that doesn't mean we blindly hide from our mistakes. I like what WB did with Looney Tunes, they put a disclaimer warning that it was there, and that it was from it's time, and that to remove it would mean removing the evidence of how far we've come.