"but a lot of us did take exception to being routinely described as child-grooming attention-seeking misogynistic deluded perverts trying to take over the world (Trans Women) or poor helpless impressionable confused lesbians (Trans Men)."
These attitudes aren't unique to r/gendercritical. You'll find them in abundance here on Mumsnet too. And yet you want in on this forum regardless. I'm not sure I see the difference, except that we don't enforce sex-based pronouns here.
I was going to say we're more polite, but thinking about it . . . no, Mumsnetters can be pretty caustic, actually 
"child-grooming" - This a valid concern which has been brought up time and time again on Mumsnet. Have you read any of the recent threads about Mermaids? Or seen the material being distributed to primary schools lately? There has also been plenty of discussion on here about Lactatia, the nine year old drag queen, and Jazz Jennings, child star of a TLC reality show. How is the discussion of these issues on r/gendercritical any different to the ones we have here?
"attention-seeking" This is also a common opinion here, particularly with regards to the more out there identities on the trans spectrum, like the animal kin ones or the "not like other girls" non binaries. This forum also has its share of women complaining about attention seeking behaviour from the trans community, whether it's trans widows describing the inappropriate anime girl clothing of their husbands, or parents struggling with their trender children.
"misogynistic" It is misogynistic to the core to suggest that "woman" is a costume you can don. Or that we are defined by the stereotypes established to oppress us. Yet the whole concept of being trans relies on it. Gender identity is a sexist ideology, no matter how you slice it. No matter how much personal sympathy you have for someone's dysphoria. Once again, this is not an uncommon opinion on FWR. Far from it. What misogyny were the women of r/gendercritical accusing you of that was so different, or so unfair?
"deluded" Look, you believe in gender identity. It's a feeling. It's not nice or polite to call you deluded over it, but at the same time, it's not totally unreasonable. I might really believe in transmutation or the healing power of crystals, and you might think me totally deluded for that. When you put your faith in the unprovable, you can always expect to be faced with skepticism. And there are plenty of skeptics on Mumsnet too. I don't see how the ones on r/gendercritical were worse.
"perverts" Again, Mumsnet isn't shy about calling out perverts, paedophiles and creeps in the transgender community either. Yes, r/gendercritical put more of a focus on it, but they weren't reporting anything that wasn't true. And often the media were too afraid to report on these cases properly. They would describe the perpetrators as women, or fail to condemn the violence in proper terms. A transwomen could murder a lesbian couple and their son and the story would be reported on as if it was a personal disagreement between women, not a lesbophobic attack. There would be op-eds written that suggested the real tragedy wasn't the murders but the terrible way the murders played into stereotypes about trans people. Some trans people would flaunt their fetishes, spout rapey conversion therapy rhetoric about lesbians, or openly threaten sexual violence against women, and the rest of the community would utterly fail to speak up against them. I saw these things happen time and again, with my own eyes. You don't police your own community.
All we ever hear, when an instance of a transgender pervert or sex attacker comes to light, is the same old No True Scotsman insistence that they're "not really trans". Self ID only seems to be real when it suits you. And then when women say "okay, but even if this person isn't trans, your proposed changes to the law still give him free rein to offend" you don't have any solution to that. As a community. The dominant voices speaking for you all seem to believe women should just accept a certain amount of risk. That some of us will just have to be collateral damage. To make transwomen feel better. To keep transwomen safe. You seem to think we owe you that. That this is a sacrifice we should make.
No-one thinks every trans person is a pervert. But it is a fetish for many men. There's hardly a story on the trans widows thread that doesn't make that clear. And there are perverts and sex offenders who identify as trans. A disturbing amount of them, to my eyes. I won't look the other way when they're dragged into the light. And if the trans community insists on doing so - if you insist on showing such little respect for women's safety that you won't even address our concerns about toilets and changing rooms in good faith - then I'm certainly not inclined to come over all #NotAllTrans on your behalf.
If Jonathan Yaniv can genuinely be said to be as trans as anyone else, then that exposes huge problems with self ID, for everyone. Women shouldn't have to pretend we don't see that and just swallow the risk to our safety. If you don't like hearing trans people called perverts, do something about the world that enables these pervs to claim trans identity.
"trying to take over the world" Interesting that you present this as if it's some outlandish statement of comic hyperbole. I think there are many women here on Mumsnet who'd say the trans agenda has in fact taken over. In many places it's a fait accompli, with women struggling even to get our voices heard in resistance. Gender identity protections are stripping away sex-based rights. Women are being called hateful bigots for defining ourselves according to the dictionary. We're being no-platformed, threatened, fired, doxxed, and censored. The fight is very real and it's not a joke to us.
You don't think so, obviously, but 60,000 women on r/gendercritical did.