I know it's usually seen from the side of men 'becoming' women, which in most instances IS a form of perversion and predation, but as a man I do get fairly pissed off about the lesser-known FtM. The sheer audacity of a female to claim she knows what it's like to be a man, that she has the experiences that come with growing up and going through puberty as a man, the expectations placed upon us and challenges we face is honestly no-less insulting than the other way around. Male and female are not JUST sexes, they are roles and rules, and while I am all-for bucking most gender trends there's certain aspects that are just hard-baked into us as an evolved species. Call them rights-of-passage, call them cultural trends, hell call them responsibilities...but I agree, you can NEVER change your sex, and stating you are the opposite one trivializes the experiences of the biological men and women who lived it and is demeaning as it is ridiculous.