That tweet gives away the entire motivation behind his reasoning. He stubbornly refuses to accept evidence against his point of view because he feels racial groupings can be used "to do evil", therefore they can't be allowed to exist.
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"With the vast expansion of scientific knowledge in this century, however, it has become clear that human populations are not unambiguous, clearly demarcated, biologically distinct groups." American Anthropological Association
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Race is real, but "extended family" is a really misleading way to think about it.
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Okay. My dog is part my extended family.
End of conversation
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