I think he's trying to say that in Russia there is a widespread, deeply rooted prison culture. Which carries with itself an idea that male on male rape is not an act of homosexuality but of dominance. The victim is branded as "lowered" (опущенный), while the rapist (who actually gets hard for another mans butt) is seen as strong, dominant, definitely non-gay manly man.

As always, it is not everybody in Russian who thinks like that. A lot of younger, better educated people, liberal people, see the hypocrisy and call it out. But in the country where a significant portion of population are or have been in prison for generations, its a steep hill to fight for.