Eddie Murphy did “Kill the White People” thirty years ago, in one of the funniest SNL skits ever:
http://www.funnyordie.com/videos/a7fde48976/kill-the-white-people-from-nino
Here is a video where the Weathermen of Bill Ayers, who helped launch Obama’s political career with a meet the candidate party in Ayers home, seriously discussed the ethics of murdering all the new born white babies.
http://www.youtube.com/watch?v=pZVbrvfAn_Q
However, something tells me Jamie Foxx's "joke" is tinged with resentment, which tends to take away from any humor that might be found.