Me. I think being gender critical is a totally different axis to left/right. The political spectrum is already more complicated than left-right because the authoritarian-libertarian axis is independent of it, so there are liberal left-wingers who are happy with people having the personal freedom to get wealthy and eg use private scgools and authoritarian left wingers who want a more proscritive socialist state with more state control preventing too much divergence from an acceptable basic lifestyle that is in line with the state's ethical principles. You get liberal conservatives who hasically want the state to do not much more than maintain an army and provide oversight to ensure that the (privately owned and operated) infrastructure of civilization functions (power, phone & Internet connectivity, water, sewage and roads) and to enforce justice, but doesn't want any state control of people's life choices so want as few things as possible to be "illegal", and authoritarian conservatives who want to uphold specific (often religion-based) values and a traditional lifestyle and want to use authoritarian state power to define contravening those values as "illegal".
We all know that being Gender Critical isn't the same as being Anti Trans. There is a lot of Anti Trans rhetoric and policy from the people in the 4th category but its not always Gender Critical, it may be Gender Enforcing. There will be gender critical conservatives in the 3rd category (ie wear what you want, do what you want, call yourself what you want but I get to believe that science is science and no one gets to tell me what to believe)
Unfortunately a lot of the "progress" made recently has been more from people in the 4th category, who parcel it up with homophobia and want to enforce compliance with a heterosexual and gender-confirming "norm" and that is rather repellent. There's bad laws in some states which will need to be reformed by a later more liberal administration before there's any fairness.
I don't understand the left-wing's capture by the trans movement. The communist party are certainly properly GC and recognise that being female is a sex class that has been oppressed and has the right and the need to unite in class struggle to achieve equality and no male can "identify in" to that class but that's usually the more authoritarian end of the left-wing range, whereas the more liberal end, which I would expect to therefore share the view of "wear what you want, do what you want, call yourself what you want but I get to believe that science is science and no one gets to tell me what to believe" is instead weirdly authoritarian on this one issue, wanting to enforce compulsory belief in a counterfactual unreality.
To be honest I think most left-wingers who aren't GC (or at least if they do believe in counterfactual unreality thenselves, recognise other people's right not to do so) are probably just not that bright and haven't thought about it too deeply, or are plenty bright enough and do "get it", and are probably closet-GC actually, but are too cowardly to stand up to the powerful trans movement.