calling a guy 'heel' (a guy who uses women)still carries less of a stigma than many of the 'names/words' used to describe women who fall out of 'social norms'

blue stocking and round heels are 2
slut begins to enter into the collection of vulgar terms and that list is a long one.

there are derogatory terms that are sexist but i think there are more of them that are applied to women.

but as has been pointed out on this board more than once, there exist misogynist and misandery attitutes and behaviors in our present day society. attitudes are changing about misogyny, but there are TV shows (america's funniest home videos, for example) who's stock in trade seems to be laughing a men being kick, hit, or other wise suffering injuries to their genitals.