I can’t speak for all GC people, but for me it’s more a rejection of seeing certain behaviours as gendered at all - rather than things individuals may do.
Current trans ideology makes what sex people identify as vitally important, and something that requires gate keeping by femininity. “Womanhood is for feminine people, being feminine is the most important aspect of who I am”.
The GC position, ironically, sees sex as primarily important for the purposes of reproduction - though, in the context of ongoing sexual inequality also important for social justice. “Womanhood is for female people, being female is a relatively minor aspect of who I am as a unique individual”.
To repeat: I do not believe what you claim I believe. I do not believe that womanhood is only for feminine people or any such nonsense. I know and love masc cis women and masc trans women.
People won't let you hold that kind of opinion, though. You'll just get flamed from both sides.
Guess who was responsible for that injury. Not Fallon Fox, but a cis woman.
MMA is an incredibly dangerous sport. If you want to talk about banning UFC I'm all ears.
My problem with GCs (in their strongest firm) is the policy prescriptions. Making medical transition harder. Making it harder to get updated documents. Opposing anti-harassment laws in our workplaces and schools. Not letting us use the bathroom in peace. GCs do a really slimy shift from policy to philosophy and back that indicates a deep disrespect for our experiences.
I know trans women who present quite masculine while being on estrogen and having changed their name and pronouns. They're butch dykes living as women, not men. They're literally exactly what GCs claim to want. But would GCs think so? No, because their brain is warped by oppositional sexism.
The GC position is absurd, untenable, and simply does not fit with the available evidence about humanity.
I find this debate interesting so I try to read a lot of different perspectives. I think the /r/gendercritical position was more nuanced than you make it out. They think that while humans can’t change their sex, rigid ideas of what it is to be a man or woman are one of the things that causes some people to feel like they need to. They would say that society should accept a and encourage a broader range of expressions of femaleness and maleness than it does now.
The GC position, as I understand it, decries the idea that a butch dyke should feel the need to live under a male identity just because she is far outside of the “firm category” of feminine or has many traditional masculine traits. It’s why they use terms like “butch erasure” [1]. It’s something interesting that I learned reading a now-banned subreddit which helped me to have more compassion and understanding for people who haven’t always had the easiest time in life.
[1] https://m.youtube.com/watch?v=IrnJOSk-3kA