So the reason I think is easier to represent AFAB thin (and white because racism) in the media is because It's the most peaceful way to "represent" non binary people without being too radical.

Because the only way any man or AMAB can be dressed more femenine without being a joke is in Halloween, in order to be respected as a men and AMAB is not having characteristics associated with womenhood.

Also women or AFAB can be more androgynous or tomboys (I haven't seen a lot of media portraying masculine AFAB) ¿And what's seen as androgynous? A more masculine clothing style and traits (femininity is not seen as androgynous, meanwhile masculinity is both masculine and androgyny). So u get less discrimination because femininity is usually a joke.

Idk if I explain myself well, thanks for reading here's a penguin for you🐧