It really is such a cliche at this point that one has to wonder if there are any heterosexual homophobes out there.
Frazier Glenn Miller, the man who shot up two Jewish Community Centers in Kansas and killed three people – all of whom were Christians, incidentally – is a white supremacist and the founder of the Carolina Knights of the Ku Klux Klan and the White Patriot Party. So he's a racist, a bigot, an idiot, and a homophobe. He was also arrested in the 80s for having sex with a black man in drag in his car. According to ABC:
Raleigh police officers had caught Miller in the back seat of a vehicle, in mid-act with a black male prostitute masquerading as a woman.
[…]
McCullough says he has read the police report of the incident but declined to comment on the specifics. “I would rather not go into the details,” he said. “They’re rather salacious. I think the facts speak for themselves and people can draw their own conclusions about how incongruous that is.”
It doesn't make him gay, though, because in a recorded interview with the SPLC he claimed that he planned to beat the man up. He didn't clarify if he had intended to do so before or after having gay sex.
