When a white comedian makes a racist joke, whether or not it is comedy is up to each individual listener. Whether or not it is racist is not up for debate: It is. Same goes for men making sexist jokes, cis/trans, het/LGB…
Comics are free to say what words they want to say. Those they offend are free to call them on it and bring down consequences upon them.
This is not censorship. We need to all be clear on that. This is people of color (women, LGBTQIA, Jews, etc.) being empowered to call out bigotry in whatever form it takes.