Yep. This.
Every single time I dip back into this thread, and I try to address some of the attitudes and opinions being offered up within it, I imagine how a similar thread (had internet forums been around) in, say, the 1950s might have looked, entitled "Gay males are genuinely sexually attracted to other males". And I suspect that many of the posts - on both "sides" - could have been reproduced almost verbatim (with "transwomen" switched to "gay men", and so on).
(Cue - of course - attempted protests along the lines of "None of the principles related to homosexuality and transidentity are in any way similar!" from some of the people who still delude themselves that none of the principles related to homosexuality and transidentity are in any way similar)
You could also reproduce the posts verbatim talking about transableism. Or transracial people.
It's almost as if your analogy is completely meaningless.