His rebuttal to that analogy is weak. The argument is invalid because race is not a choice; homosexuality is. Race is not a lifestyle; homosexuality is. Race is not per se deviance; homosexuality is. Finally, race does not carry with it any inherent values; homosexuality does. And those values are at odds with definitive social norms that have existed for centuries.
They are at odds with definitive biological structures that have existed since the beginning of time.
If you look at it from the point of view concerning the book of Genesis, or mammalian biology for that matter, homosexuals are idolators of perversion. It is in no way an anatomical function.