"@Ides why have you got "objective" in quotes? That implies that you don't believe there is an objective way to assess someone's sex."
It's because of what I learned, from Jurgen Habermas and others, about what Habermas called 'objectivism', over the years. This is the view, roughly, that while lots of knowledge is open to opinion, there remains a branch of knowledge that is 'scientific fact'. It 'is what it is', and that's that.
This 'objectivism' hit its nadir, many would say, under the Nazis' theories of race-differences. They asserted that races were plainly different - just as, indeed, vaginas were different to penises, one might say. It was easy, from that premise, to argue, for instance, that if you were Jewish, you were dangerous; if you were Aryan, you were peachy, fluffy, lovely and everything nice.
You can see where I'm going with this, no doubt ....
You have to grasp that for the Nazis, such racist thinking was absolute, undeniable, in-your-eyes objective fact. The difference in races was obvious and irrefutable. The only problem was that they pushed the reasoning beyond that to ... well, as we all know, such things as 'Jews are dangerous and evil' and 'Negroes are primitive'.
In the same way, to me, the GC case is steeped in the tacit view that if a person has a dick and bollocks, that person is inherently wrong, nasty, dangerous ... or at best, 'other'. Now, you may protest, 'No, I see nothing inherently wrong, nasty and dangerous about a person who has a dick and bollocks' ... But, if you're a full-on GCer, qua the standard Mumsnet definition, as I see it, you do. You really do. This person who has a dick and bollocks is a 'worry' to you, if you see said person in your toilet or dressing room. This person could, theoretically, hurt you. At best, this person could, by virtue of having a dick and bollocks, mar your sense of dignity in some way.
It's about the focus, really. You may admit that other natal women - those who are rough, violent, pushy, prejudiced, etc, etc ... they could be a problem in a women's toilet or changing room ... but you don't focus on them. You focus on the people who have a dick and bollocks.
Anyway, to get back to that word "objective" .... No. There is no bias-free, comfy, clear-cut and simple distinction between 'objective' and 'ideological'. That distinction is simply drivel, unless it's utterly and completely free of value-judgement. In this debate about those born males and those born females, it really and clearly isn't. It's loaded to the gills with value judgements about those who have vaginas, versus those who have dicks and bollocks ... way, way beyond what Biology has to say about it. This debate isn't about objective fact versus ideology. It's no more than Philosophy 101 to show that it isn't.
Jeez, you know, also, and as a corollary: One of the major thrusts of feminism has always been that of a preference for nurture over nature. 'It doesn't matter', the earliest feminists said, 'that I've got a vagina - I can still work in a factory, do mathematics; fight in war, lead a country'. But now, with the GC case against transwomen ... all that has apparently gone out of the window. It's perverse. You're equipped with a dick and bollocks ... no, you can't ever be other than dangerous; you can't ever be better than a worry to natal women around you. Natal women will always be vulnerable to you, because they have a vagina and never had a dick and bollocks, and that's absolutely that.
And no amount of hormones you, the transwoman, might take ... no level of starving yourself, the better to keep yourself smaller and as dainty as you can manage ... none of it will change the fact that you are inherently an oppressor, because you have - or once had - a dick and bollocks. To the point that yes, just one of you, in a women's changing room, is a menace to all the women there.
Yep, that right there ... that is pathetic. Holy crap, if feminism's purpose was to give women self-belief and strength, it's utterly failed if all it takes is one transwoman in our toilets and changing rooms to turn us all into terrified, squawking chickens. Jesus. Really, are we that delicate and fragile? Is a dick and a pair of bollocks still that much of a menace to us poor little things - even if they're attached to some poor sod who's as bullied, traumatised, desperate and miserable as most transwomen are?
I have no time or respect for this version of 'feminism'. Its sole aim, it seems to me, is to reassert women as victims, in the horrified and outraged realisation that women - or some women - are now being called bullies - because that's exactly what they are. It's beneath us, as women with guts, as far as I'm concerned. It's a failure of the one, fundamental, thing that feminism was meant to give us.