I was wondering how an exclusion would work that was all. It would be difficult to enforce even if you could get a motion passed. I can see why it's upset you if you feel strongly about it.
Bless you. Yes, I do feel strongly about poor logic, especially when it's being deployed to marginalize and disempower female people in a political, professional or social space.
I do not, however, feel upset that the possibly that having female-only inclusive space that is 100% guaranteed, at all times to be inaccessible by a male engaged in deliberate deception may not be viable, means having a female-only inclusive space that is politically and socially accepted as female-only, from which most males will voluntarily self exclude and from which males found to have entered dishonestly can then be actively excluded is also not viable, because obviously the former does not imply the latter.
In my opinion, in today's world I don't think you'd get the exclusion agreed in the first place. But if you did get a debate organised, followed by a vote, and that vote didn't go your way - would you then leave it and accept trans women as members?
If, if, if....
Actually I'd prefer to leave the WI to go their merry way and simply be free to set up new female-only provisions where that expectation is clear from day one, in a society that respected female people's need for and moral right to single sex provisions.
If, if, if I did that, do you think it would be respected? Do you think trans women would say "fair enough, we are not female, this isn't intended for us and we are no more excluded than any other male"? Or do you think it's "not viable" because some male might theoretically see it as his right and duty to insert himself into my space anyway, and if I can't provide 100% certainty I don't deserve anything at all?