I totally agree.
Homophobia has always been somewhat connected to misogyny. I would even say, homophobia is the logical consequence of misogyny.
Lesbians are punished for rejecting men, gay men are punished for questioning the patriarchal sexuality. If "sex" consists of a person fucking an object (and that's what patriarchal definition of sex is) then prison rape is no problem (and indeed, I am sure most men who do it don't identify as gay, or are even attracted to men) but two men in a loving relationship who see each other as equals? That just can't be. Women might want to be seen as equals, too, if they are exposed to that sort of thing.
I see the trans nonsense as a backlash against feminism. It is homophobic because homophobia is needed to back up patriarchal ideology.
Men fucking men in dresses is okay with patriarchy, because then, the hierarchy is clear.
Men in dresses fucking women is also okay, as while it might officially be called a lesbian relationship, you don't have to ask who's being fucked.
Women being in relationships with women? Fine as long as they are still willing to be fucked by men.
Note that the worst thing a transactivist can think of is a TERF, a trans exclusive radical feminist.
That's the worst thing a woman can do to a man: Excluding him. Not insulting him, not beating him up, not raping him, not killing him - simply not allowing him to enter her space.
That's what the whole trans movement is up against. Women excluding men.
Male violence is sometimes mentioned as reason why males totally need access to women's spaces, to be safe from other males, but much more often, there's just some nebulous statement "many transwomen are murdered!" without acknowledging that they are murdered by males.
What this man did to your fiancé was horrible. And yes, nowadays, everyone and their sister (not their mother ... I hope) would be on the side of the harrasser.
For a lesbian, it is a given that the male who tries to bully her into letting him rape her will be stronger than her, and she's also (to varying degree) socialized to appease males, so more likely to not even dare to reject him in the first place.
(I don't often hear transactivists demand that straight men have sex with transwomen. Probably because they are well aware many men would just punch them in the face instead of politely pointing out that they're straight. Might not be a coincidence that your fiancé was targeted instead of someone as big as the harasser ...)