Why is it culturally acceptable for a black man to rant against black people, yet racist when a white man does the same thing?

Here’s my example.

RE: "But what are you doing to help black people? 'Your' people?" (My Ten Tips to Help "The Black Community")

I could never hope to get away with saying the stuff in there. I’ve made similar posts before and had them all taken down.

And I’ve had people call me racist just for saying the same stuff that’s in there.

Why is it culturally acceptable for a black man to rant against black people, yet racist when a white man does the same thing?
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