Do white people really have a problem with the way blacks speak amongst each other?

I don't remember who said this but I read a response to a question about black people and someone mentioned that they had black friends who were perfectly intelligent until they were around other błack people.

Does it bother white people when black people switch dialects depending on their company?
Update: I understand your points but do people actually use the same voice at work as they use with friends? I sure as hell don't.
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