It's heartbreaking. I don't want to argue about whether transwomen are "women" or not, not least because it's blinding obvious two groups using one word to mean two different things are both right according to their own definition and therefore are never going to find agreement.
All I want is legal, social and political recognition of the blindingly obvious fact that some people are female, and that this has repercussions for them, some simply physical, some socio-economic, and some an intersection of both, and that the reasons why up til about five minutes ago we accepted female people have good reasons to have spaces and opportunities that are female-only have not disappeared simply because some men feel the word "woman" is a better fit for them than "man".