Since when was being a whore a matter of race or skin color?

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The racist portion of the joke wasn't the reference to prostitution, it
was the need to use the stereotypical accent and slang associated with
African Americans (ebonics) to make a very poor pun.

Litmus test: Could JohnH tell that joke to a class of mixed race
teenagers while subbing at a public school and expect there to be no
reaction? (Beyond the predictable lack of laughter, of course).