Frankly I think a reason it works so well with gays and lesbians is due to internalized homophobia. We're told our entire lives that our sexuality is wrong, so it's harder to stand up for it. Some of us suffer a life of homophobia before finding a bit of shelter in LGBT groups, so it's hard to not follow what the rest of the group is saying when you feel like this group is the only one that somewhat accepts you.

There are many straight men who love virtue signaling and to show their white/cis/straight guilt, but in the end of the day they come from a completely different mindset. A gay guy could be kicked out of all (or most of) the gay spaces he knows for reffusing to date trans men. But a straight man wouldn't ever be missing spaces that embrace his sexuality.