@LajesticVantrashell
Thanks for starting this thread -- it's really good to find a space where all this stuff is being talked about so respectfully!
^But gender identity is now an innate sense of who you feel you are ("I'm a man who likes to care and nurture, which means I feel like a woman") But this isn't linked to anything that I would traditionally think of as a characteristic of gender. It's purely this nebulous concept based on an unwillingness to conform to sex stereotypes.
Isn't this (in part) what feminism has been fighting for for years? If we really stripped back the layers, would we not find that in danger of violently agreeing with each other?^
For me, gender as a nebulous concept is fine, so long as we keep both the categories 'sex' and 'gender' separate. Your gender identity can be whatever you want it to be, but you still have a biologically sexed body.
However, I have two main conflicts with the full "gender is just a social construct".
Firstly, the campaigns for full self-ID. Self-ID allows anyone to define their gender however they like - "I feel like a woman, therefore I am a woman". That might be OK, except that there is also a push to replace sex-based rights/protections for women with gender-based rights.
When you combine those two changes, you remove the right for women (as the sex-based category) to protected "spaces". That has really big legal implications. For example, it would enable trans-women to compete in women's sport, potentially based on self-id alone, without suppressing testosterone levels. This isn't just hypothetical: it's been a big issue in America, where trans athletes were winning state high-school running championships, meaning that girls missed out on sports scholarships.
(Without the vocabulary to differentiate sex and gender, it also gets really hard to talk about what the problem is here -- if both cis-girls and trans-girls are in exactly the same 'girls' category, then nothing bad happened. If we acknowledge that gender identity and biological sex are separate categorisations, it's clear that there's a rights conflict between trans-women who want to be accepted as their preferred gender; and cis-women (plus trans-men) who need specific protections based on their natal sex.)
Full self-ID in the context of gender-based rights is also open to abuse - like the male police officer on another thread saying "how do you know I don't identify as female?" to justify searching a woman. Without specific, clear, sex-based rights it's very hard to prevent obvious abuses (by men) or to make a legal argument that appropriately describes the abuse that occurred. If anyone can self-define into a legal protected category, it ceases to have any meaning.
My second conflict is based on the back-conflation of sex and gender, which is now serving to reinforce harmful gender stereotypes. We see that in Susie Green's TED talk. She states that she realised her child must really be a girl, because (aged 4?) they like to play with Barbie dolls and other toys 'for girls'. Similarly, in Louis Theroux's documentary on Transgender Kids, parents and psychologists talk about how a child (aged 6?) must be a girl because they enjoy wearing sparkly outfits and making dance routines.
That feels really regressive and homophobic. Like you said, we shouldn't have to conform to gendered stereotypes. But that's not at all the same as saying that if you don't conform to male gendered stereotypes you must actually be a girl (or vice versa). Especially if "be a girl" doesn't just mean "feel like you have a feminine gender identity" but becomes "actually is a girl" (and should have corrective surgery to make the body match the gender identity), because we've removed sex-based categorisations and only talk about gender.
Similarly, there's been a huge rise in referrals to the UK's gender identity service of teenage girls who want to become boys. Any huge numbers of staff are extremely concerned that they are not receiving appropriate care: because of the push to always affirm trans children in their chosen gender, there is a risk that children are given puberty-blocking drugs (with bad long term side-effects), cross-sex hormones (with permanent effects) and genital / breast surgeries that they later hugely regret. And these procedures are not well-evidenced at all. The best research showing reassignment surgery reduced dysphoria was recently corrected after a more thorough analysis of the data showed no significant effect of surgery on mental health; and the only research on puberty blockers found an increase in suicidal/self-harm thoughts in the teens who received the drugs.
At the moment, even talking about these issues can get you shouted out of town as a transphobic bigot. And yet, they have huge implications both for the legal, sex-based rights of women; and the safety of potentially extremely vulnerable children. These are nuanced, complex issues - they should be worked out carefully with appropriate regard for complexity; not by who can organise the biggest Twitter pile-on.