It seems to me that often times, when a group is marginalized by society, they feel that it gives them license to actively harbor bigoted attitudes against other groups. Take, for instance, how much less tolerant African Americans are of gays by and large compared to white people.
People are so ignorant. You're biracial yourself, but you dating a white person makes for an "interracial couple," but you dating a black person doesn't? Such nonsense.
Finally, I think the following video about homosexuality in the black community will prove to be most enlightening:
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