That's not true. The transgender lobby, the faction, the political perspective - that's not a mistake. Let's not pretend they don't have politics.
According to the WHO, gender is a social construct:
Gender refers to the characteristics of women, men, girls and boys that are socially constructed. This includes norms, behaviours and roles associated with being a woman, man, girl or boy, as well as relationships with each other. As a social construct, gender varies from society to society and can change over time.
https://www.who.int/health-topics/gender#tab=tab_1
Gender, as the WHO says, includes norms behaviors and ROLES associated with being a woman, man, girl, or boy, etc.
Sex refers to “
the different biological and physiological characteristics of males and females, such as reproductive organs, chromosomes, hormones, etc.”
Gender refers to "the socially constructed characteristics of women and men – such as norms, roles and relationships of and between groups of women and men. It varies from society to society and can be changed. https://www.coe.int/en/web/gender-matters/sex-and-gender#:~:text=Sex refers to “the different,groups of women and men.
If gender is biological, then why would the transfolks say that having a penis has nothing to do with gender? I mean, the only way their argument makes sense is to say gender is in the mind, and people "identify" as a given gender, which may be man, woman, both, neither, other, genderqueer, genderfluid, gender outlaw, agender, bigender, ambigender, etc ect., and the biological part is sex.
I agree with you that women evolved differently than men, and that evolutionary psychology illustrates differences between males and females in the human species. However, typically, the left rejects evolutionary psychology, particulalry feminists.
I never said females are all alike - quite the opposite.