Why is it OK for a black to be racist?

When Black call whites with all kind of racist words, everyone takes it for granted and do nothing just because blacks used to be abused. It's similar in the middle east. Jews are allowed to be racist towards muslims and noone does anything just because they suffered the holocaust.

This kind of behaviour cannot and should not be tolerated.

I say we get a white supremacist on Comedy Central.  Hilarity will ensue.