You claimed stereotypes were a problem:
"which argues that women have been unjustly confined by a society in which sex status (i.e. man or woman) is held to require or entail conformity with a narrow stereotypical range of gender presentations and roles."
Which suggested stereotypes shouldn’t be maintained (that you seem to hold trans people responsible for when in fact it's the broader population that enthusiastically do). Your comment implied it's wrong to adhere to stereotypes hence the the logical conclusion being you were taking prescriptivist conformative approach on gender presentation.
"It is only the genderists who take any of those presentational/attitudinal variables and call them markers of womanhood, who tell young girls that they are "really boys" if they find it hard to cohere with gender stereotypes, particularly the male-gaze and/or porn-saturated box that our sexist society drags them towards."
The problem with this analysis is that regardless of what trans people do its the broader population that would continue to maintain limited gendered stereotypes. Gendered stereotypes have been around a lot longer than trans visibility so its patently false to hold them responsible.
The other problem with your analysis is that you seem to b under the false impression that gendered stereotypes are a monkey see monkey do phenomena. That there's no organic inclination influencing choices that maintain those stereotypes. You seem to be implying that embracing femininity or masculinity is a 'copying'/learned phenomena rather than there being any independent internal connection with that choice. It's as good as saying 'if I see gay people I will become gay'. But our choices often have deep evolutionary roots or genetic ones.
Embracing gendered stereotypes is more likely an extension of an evolutionary psychological drive to appear more attractive to the opposite sex so it's unlikely that stereotypes are changing anytime soon regardless how egalitarian society has become.
"It is only the genderists who take any of those presentational/attitudinal variables and call them markers of womanhood, who tell young girls that they are "really boys" if they find it hard to cohere with gender stereotypes, particularly the male-gaze and/or porn-saturated box that our sexist society drags them towards."
Again, no one is 'telling' anyone anything. It's simply a matter of a minority of individuals who consider their femininity or masculinity a defining aspect of their identity & want to embrace it to its capacity.
"Bloody hell. It is incredible, the degree of stubborn persistence in motivated misunderstanding."
Well, if you perceive the world thru the limited lens of contagion & monkey see monkey do it can certainly seem that way.