How is it workable to say that some 'women's' groups can allow some male members?
By defining them by gender and not sex. If someone is looking for a single sex group and finds a single gender group then they continue to look, and vice versa.
We have no definition for, in this example, transwomen.
This is disingenuous. Trans people are protected by law. There is a legal definition that works perfectly well.
So when you say a book club should be allowed to accept 'transwomen' who do you mean?
That if a women's book club wishes to accept trans women as members then should be able to - by gender.
In what circumstances would a book club need to be able to accept 'transwomen' but not other male people - be they 'cis' or non-binary?
They don't 'need' to do anything - they can be single sex if they wish to be. If they want to welcome trans women as they accept them as women - then they should be able to. Who are you to say they should be denied that choice?
How would a woman who requires a 'women-only space' know which of the 'women-only' groups she looks at are 'women-only' on the basis of sex?
Presumably she'd be able to ask a question or read the groups description? See the recent hiking thread on here - that's openly welcoming of trans women and non-binary people. And hugely popular.
As ever 'trans inclusion' is privileged above female inclusion as 'trans inclusion' will force some/many women to self-exclude.
Allowing options isn't prioritising. If they wish to join a single sex group then they absolutely can do that. They shouldn't be allowed to demand that everyone else bows down to their opinions. The same is true of trans women trying to join a single sex group for biological women - they shouldn't be allowed to force others to bow down. I want both sides to have equal opportunity - you want GC views to take precedence. That is hypocritical. I don't seek to force my views on anyone else - but you do.
You advocate for making women's world's smaller to placate a small number of male people.
Not at all. Having women's groups that welcome trans women does not make the world smaller. But having a view - and forcing that view on others - that others dislike? That will make your world smaller by virtue of people not wanting to be around you. You can't force people to like you if they consider you to be bigoted.
Not one person is saying that groups cannot be mixed-sex, only that mixed-sex groups should be clearly identifiable, so that those who need single-sex spaces and services can find them.
On that we're agreed. The only difference is that I think groups should be allowed to be single gender as well if they choose to be. You don't.
You do no-one any favours by repeatedly characterising women refusing to put male people first as 'transphobia'.
That's a mischaracterisation of what I've written and you know it. When your sole aim is to exclude trans people regardless of situation and context - that is transphobia. There is no other reason to want to ban biological women welcoming trans women into their group - unless you think your transphobia is more important their agency to do what they believe is right.