I'm not a psychologist but there has to be some deep-seated self-loathing from repressing their true sexuality/identity for decades. Or maybe they subconsciously feel "if I can't be who I want to be, you can't either."
I am a Psychologist. They gain status from being assholes, because enough people privilege assholes with status. Authoritarianism requires an outgroup to oppress, and people think that hostility and oppression is 'strength'. The original theory (which is not entirely supported by evidence) of the Authoritarian Personality is based on Freud, and it says that a similar family dynamic of a powerful father who arbitrarily abuses and oppresses others is the basis.
I've got a theory on this: They have gay urges and therefor think everyone has them, so they believe that everyone needs to "choose to be straight" and it's just weak sinners who are giving into their urges.
Also to grandparent: it's allllllll projection with conservatives.
Repressed gay works just fine tbh, most people probably use "closeted" but that's more colloquial.
However, referring to a gay person as a "gay" can be a bit problematic as it strips their personhood from the statement. A lot of bigots will refer to gay people that way to imply they are lesser. I dunno if that's how it works in other languages, but at least in English it's generally more respectful to refer to groups as people specifically. So you'd always say "gay people" or "black people" and etc.
Fixed that then. I chose repressed over closeted, as I feel it emphasises the point that they're pushing themselves deeper into the closet, but maybe that's a linguistic nuance I'm misunderstanding.
There is a fair amount of speculation that being bi is actually way more common than is generally thought but because current cultural rules of compulsory heterosexuallity codes being bi as being something you must act on to actually be considered that identity a lot of people believe that they are straight simply because they never acted on the attraction.
For guys the comp-het mindset also tends to discount basically any situation where they feel dominant because "straight" and "masculine" to them basically means that as long as they are the petetrative element in a place of absolute control via power dynamics or violence then it doesn't count as "gay". Essentially since as long as it holds no emotional attachment to them it doesn't count. As long as they can't code their behaviour as "feminine" it doesn't count.
Self-contradiction is inherent to fascism and exclusionism. It is a feature, not a problem. It demonstrates that if you are something the fascists hate, you are immune from punishment if you simply support their cause. The more you support them, the more immune you are. Trump is immune from any criticism, whether it be adultery, rape, bigotry, stupidity, etc. The lower you are, the more you have to earn your protection in case they take control. This is their most important tool in recruitment, whether they understand it or not.