Why do some Whites say, "All Blacks are good at singing & dancing"?

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There was another question about Black contributions to the world, and that was what this White user said. If singing & dancing isn't a skill or a talent--why can't White people do it? Or why is it that When Blacks do it is looks/sounds 100 times better. That's like me saying, "All Eistein was good at was math". There is more than one kind of intelligenc, and Whites selectively pick the ones that favour them so they can say they are smarter. If Blacks were good mathematicians, Whites would say math is irrelevant, because they happen to be good at athletics, singing, dance, and music--Whites say those are irrelevant