I think it should be regarded as a hate crime, culturally.
In regards to male on male rape, in situations where women are not available...
Interestingly, I read in a study on bathroom sex segregation, that women find female bathrooms a safe zone, because there are no men. But men find male bathrooms an uncomfortable place to be, essentially because without women to bond over oppressing, and focus on, their attention turns to each other.
I think in prison, when men's ability to control women is taken away, they will try to turn other, lower status men, into "women." Which is the worst way a man can be humiliated. A beating wouldn't carry the same total emasculation and breaking of being anally penetrated, like another man's 'bitch'. And the other man gets sexual pleasure from it, so it's win/win for them.
I also think a lot more people are heterosexual leaning, but bisexual to some degree - enough so that in a situation where men's preferred sex is absent, and they do not fall in status by being "gay," they will happily penetrate other men (but not be penetrated.) Especially if that penetration brings a boost in status. After all, many men will quite literally fuck anything, or any one, from rotten coconut (a recent viral story,) to middle-aged prison inmate, to 83 year-old woman.
It's all about sexual pleasure and dominance/power displays within a hieararchy, with a good dollop of sadism.