SocProfRacists are always obsessed with people "crossing" race lines. This is why segregation systems always include anti-miscegenation statutes (see; Loving v. Virginia). This was also the case during apartheid in South Africa. Biracial individuals are always a problem for racists. The same logic applies to sex and gender (only 2 sexes and one "correct" sexual orientation, and one "correct" gender identity.
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