I think generally it is due to conservative indoctrination from birth installing the bigotry and that eventually being in conflict with their actual desires. Their families and/or religions tell them what to think before puberty and then eventually they grow up and can’t help but be sexually attracted to whoever they are into, but their brains keep repeating that it is forbidden. This type of repressive spiraling leads to more and more drastic behavior due to shame and guilt as they are forced to hide their inner truth from themselves and their communities. We see this with homophobia and trans chasers as well