Transwomen are biologically male. They are born biologically male and they remain biologically male.
I accept that it must be very hard to suffer from gender dysphoria. I wish transwomen well. I support their right not to be discriminated against in housing, employment and in life in general.
But biology matters. It is biology which means that women in Ireland and across South America and in many other parts of the world are the ones who get pregnant and are then forced to give birth against their will by political systems that deny them the right to abortion. It is biology which enables people in cultures which practice FGM to recognise which babies are female and thus decide which ones' genitals need slicing off with rusty razor blades. It is biology which dictates which foetuses are aborted simply for being female, which infants are allowed to die simply for being female. It is biology which means we are, on average, smaller and less physically strong than men and thus at higher risk of domestic violence up to and including murder (2 a week in this country, into the hundreds in Russia which has recently legalised domestic violence).
I am not prepared to lie about biology. Facts matter. The intersection of facts and political beliefs matters.
This is a hill on which I'm prepared to be banned from Mumsnet.