The biggest language slip is gender instead of sex. The whole house of cards rests on the fact that people have bought that gender (feminine, masculine; language used by feminism from the 1970s onwards to show the ways societal structures and ideals shaped the paths and choices open to women and did not rest on female biology).
Gender is not sex - at all, and was never intended to be used as such. However, the advance of gender studies (and the language of gender) replaced women’s studies (and the progress of women’s rights).
The march of gender brought greater understanding of masculinities and how they were constructed (but took the political impetus out of talking about women and being female - if you talk about gender, you talk about the interactions in society of men and women, what is perceived as feminine and what is perceived as masculine - that is observational, and analytics - but not a political force for change)
Then the concept of gender identity (an innate sense of whether one is masculine or female) helped conflate masculine/feminine with male/female. A man can be feminine - no issue there (aside from the entire concept of certain things being feminine, and thus associated with the historically weaker sex, caring, domesticated and objectified woman). But by being ‘feminine a man cannot become a woman, only a feminine man.
Unless you confuse matters by calling gender sex. Because of gender is masculine/feminine, then that can be changed. And people prefer to say gender when they are not talking about the sexual act. What gender is your baby? The question sets my teeth on edge because even if you believe in the concept of gender identity as an innate feeling, how can a baby express or say this? Any gender specific clothing, colours etc for a baby are determined by sex!
So language is important.
What language do you find difficult to understand? Happy to help but it might be better on a new thread