Why are separate spaces for trans people unacceptable (to trans people)?

They want to use women and girls as props without the women and girls' consent.

That's the main aim of TRA ideology. A lot of 'transgender women' or those who I believe really prefer the term transsexual aren't like this, but the movement itself is all about the use of unconsenting women. If it wasn't, 3rd spaces would be enthusiastically embraced and used. And they're not as above.

It's why they're called the TRAliban because ideologically, there's a lot of common ground.

Regarding the need for single sex spaces, as there are only 2 sexes, there only needs to be 2 types of sex spaces - male and female.
Born male? Use the men’s etc. Feel like a woman? Tough, you’re still male. And don’t even suggest people using toilets designated to disabled people. Being trans isn’t a disability in and of itself.

Just watched Emily Bridges (ex male cyclist, now trans) who was horrified at not being able to compete in women's professional cycling, being interviewed.

Was 'so upset' at not being allowed to compete. Interviewer said, but you are allowed to compete, not in women's, in 'Other' category

Absolutely not an option, apparently

Because, because... fuck knows

Because mixed sex facilities don't provide the men who claim to be women with their validation for their special identity or 'euphoria'.

Ruins their fantasy of womanhood if they have to piss around other men.

Likewise with the sports. Too crap to compete against other men so by competing in the women's category they get the prizes without effort.

The majority of trans males, the AGP transwomen, don't want them because part of their fetish involves affirmation of themselves as women, even forced. Hence they want to be where women are, because they want everyone to acknowledge that they literally are women, and get off on that. It's a sexual fetish remember. You're not going to be happy with trainers if you've got a high heel fetish.

As others have said - spaces are not the commodity here, women are.

Some transpeople are ok with it but many on the more activist side would find it unacceptable as they hold to the line of transwomen are women, transmen are men. So even if there was a third space they wouldn't use it in preference to the women's or men's as it wouldn't validate their beliefs about themselves.

See for example Emily Bridges' latest interview saying that if Emily competes in the "open" category but is excluded from the "women" category, Emily is being excluded from cycling altogether. Because if transwomen are women, Emily is a woman and therefore should be in the women's category (and not in the "third space" of the open category).

The phrase "transwomen are women" is a great example of a thought-terminating cliche.

Transwomen want to be validated, it's not the space they want, it's the women in there.

Trans people aren't a homogeneous mass. Some will want third spaces, others won't. I've seen posters on here argue for and against third spaces too.

Short answer- they don't want a space, they want the women in the space. The use of the women in the space is the point.

See for examples, India Willoughby, who has written of avoiding a handy unisex loo to deliberately seek out a women only loo further away: or swimming judge Anne Coombs, who got angry at being given the key for a unisex changing room at a hotel pool, and wanted to use the women's changing room.

Transwomen Miranda Yardley and Fionne Orlander stated a campaign for third spaces, which got no support from transwomen or from charities like Stonewall.

If prominent trans rights charities had fought for third spaces, we'd have fought with them. That isn't what they want.

Third/open events in sports are fair for women, they have been tried;

''Swimming World Cup category for transgender athletes cancelled after no entries received''
https://www.theguardian.com/sport/2023/oct/03/swimming-world-cup-category-for-transgender-athletes-cancelled-after-no-entries-received

Trans people don't want them so wouldn't use them. Transwomen want to use women's spaces and things because they believe they are women... Or want other people to, anyway.