I know a guy who's a sex worker and he has had quite a few clients who are actively homophobic. When he told me this, I made a comment based on the assumption that these guys were closeted gays with internalised homophobia and he said "no, I think it's something deeper than that"
His theory was that it's basically a convoluted humiliation kink, where they are genuinely grossed out by the idea of having sex with a man, but they do it anyway because of the tabooness of it