ChestnutStuffing - ” Where you would lose a lot of them is in saying that any kind of culturally mediated/expressed differences between men and women are only caused by socialisation, are a manifestation of patriarchy, and would be better off abolished, and an important goal of feminism is to accomplish that.”
I agree - because these are elements of dogma, not incontrovertible, scientific facts, and they therefore require a leap of faith. Choosing not to take that leap is not necessarily due to stubbornness, lack of “education” or misogyny but rather to healthy scepticism.
MedusaBadHairDay - ” I think what throws me with this particular subject, it's there is huge support for campaigns like Let Toys Be Toys (which is very much saying that differences are a result of socialisation and should not be enforced) and that support is from radfems/libfems/ people who'd never call themselves feminists - but that doesn't then translate to widespread agreement on gender as a social construct.”
This is equally understandable, IMHO. Gender does not need to be accepted as 100% a social construct in order to be against forcing children to play only with “stereotyped sex role” toys and for encouraging children to play with a wider range of toys.
In fact, it is possible to totally reject the notion of gender as a social construct and still support “Let Toys Be Toys”, eg. transgender ideology would support boys playing with “girls’ toys”, vice versa and “unisex toys” on the basis that toy preference reflects innate “gender identity”.
Feminism draws certain conclusions about the world because it interprets observable phenomena according to a specific belief system.
I shy away from discussions about what it means to be a “real” feminist because they always seem to end up with one or more purists identifying heresies that need to be rooted out. BTW I am NOT suggesting that anything like that is going on in this thread.
The problem that I have with “RadFem”, as a term and as a thing, is that it includes truly “fundamentalist” feminists who brook no dissent.
The term “radical” originally meant “root”, as in “fundamental”, but it also means “extreme” in the same sense as “fundamentalist”, eg. relating to religion.
That, I think, is part of the reason why a lot of people, men and women, switch off when they hear the word “feminism” and dismiss arguments by disparaging them as “feminist”. Not “misogyny” as a reaction to women or womanhood but more akin to Islamophobia, anti-Semitism and whatever you would call fear of fundamentalist Christianity or any other religion. It is not to do with individual people but with the extreme tenets and would include antipathy to extreme political views.
I am thinking out loud here, these are not well-developed ideas but more like musings so I am not wedded to them nor prepared to defend them to the death 
They are thoughts at the back of my mind that I think account for the fact that I tend to talk about “Women’s Rights” rather than feminism but I am perfectly happy to call myself a feminist or be called a feminist.
I also agree with previous comments that “Gender Critical” as a term has its problems. As far as its relationship to Transgender Ideology is concerned, I agree that it is used as a catch-all term for what is very often (most often?) better described as something like “Anti-pseudoscience” or “Pro-Science” without any presumption of adherence to a feminist viewpoint.