In answer to the question (and I am trying to pick my words carefully so as not to offend anyone but I need to be able to describe what happened...)
I attend a women's only martial art class that involves sparring with each other etc. I have done martial arts before in mixed groups and liked it but I found the atmosphere in the women's only lessons completely different, in lots and lots of ways, and really liked it so stuck with it. Also it makes sparring/contact boxing easier because, while I really like men I don't enjoy being hit in the face by men (even very lightly/non-contact). Its just a completely different experience.
The women in the group are a mix of ages from late teens to early 50s but the majority are in their twenties/thirties. A huge range of experience levels an backgrounds. One time two transwomen joined. They seemed perfectly nice, and people smiled at them, no-one said anything horrible but, when it came to pairing up/changing partners no-one wanted to partner with them. And this was in a group which contained the age range most likely to argue TWAW. At the time I would have said TWAW too if asked but I still felt very uncomfortable about boxing with someone who was that much bigger, more muscley, broader than me. Even though I felt fine boxing with women who were stronger, bigger and better at boxing than me. It is just different. The other thing is, and this is going to sound bitchy, but although they were "dressed like women" (Think padded/push up bras, tight T-shirt and small tight shorts) they weren't dressed like any of the women there actually dressed (sports bras with T-shirts, jogging bottoms or long shorts).
In honesty even though no-one was hostile and everyone was super polite/smiley, the atmosphere was awkward and completely different to normal. And the two TW also seemed to find it very awkward as they stood together unsmiling and looked almost scared of the women and left half way through. So I don't think anyone benefitted. All it did was emphasize the differences.