I take it (GC) to mean being critical of the idea of gender. Someone who disagrees with gender being something innate that one can 'feel', as opposed to a socially-determined set of norms is, I suppose, gender-critical.
That is my view of gender (that it is not a fixed state, not a 'feeling' but more about convention), but that doesn't mean that I necessarily agree with everyone who also holds this view, or that they will necessarily agree with me.
IMO, saying that someone likes the norms traditionally associated with the opposite sex must be someone of the opposite sex who is 'in the wrong body' is the ultimate in regressive support for gender stereotypes, and I believe that that way of thinking is always going to be detrimental to women. If that makes me gender-critical, so be it, but as with the things we've been discussing earlier, when it is used as an insult and as a way of grouping others who don't believe that TWAW together, I don't like it at all.
There is far too much telling us what we think, and why we think it (social class, privilege, ignorance, prejudice, phobia, whatever it might be) but we are individuals with different views.