"Can anyone help me with a way to explain to ds how opposition to the the transwomen are women narrative isn’t using all the same arguments that were previously used against homosexuals?"
As a lesbian myself, when I was younger, it was common to hear people (mostly males) thinking it was unnatural for women to not want to have sex with someone with a penis.
Nowadays, TRAs are saying exactly the same thing...........
Old days (from lesbians to all and sundry) 'I'm attracted to who I'm attracted, and that is fine'.
Nowadays (to lesbians, from TRAs) 'You're attracted to who you are attracted to and it is wrong' (you nasty vagina fetishists you!).
Gay people weren't saying they were the same as straight people, they were saying they were different, but of equal worth (and might want to hang out amongst others of their own kind). Whereas TRAs are trying to stomp into someone elses spaces and demanding to be let in. It's the difference, in effect, between demanding to get into someone elses straight wedding, and asking to be allowed to have your own specifically gay and far more fabulous one! My lesbian marriage doesn't effect your straight wedding in the least, it takes away nothing from you (apart from meaning a bit more competition for bookings of wedding venues!). Whereas TRAs, again, don't want to organise their own specific trans spaces set up for their own particular needs, but instead want to invade existing women-only spaces.
(as regards 'invasion' BTW, it was always straight folks and particularly hen nights trying to invade gay spaces, or straight men trying to invade lesbian nights. Now TRAs are trying to do the same thing.).
Best argument though is perhaps the many lesbians and gay men who are against the current TRA narrative. How did they supposedly go from oppressed minority, to being the bad guys? Why would drag queens, fags, and dykes have an issue with TRAs (and many of them do).
Plus, TRAs are being naughty co-opting someone elses struggle to try and support their own. As they also do trying to co-opt the issues that intersex people have (who have repeatedly asked to be left out of that argument please, since intersex organisations campaign to refuse surgery on infants and children unless absolutely necessary, whereas TRAs seem to be arguing for the opposite, with surgical/medical intervention as soon as possible.).