Obvious answer is obvious. Fanservice of this kind is much rarer than the endless parade of nearly nekkid wimmins in comics, as well as the endless sexual harassment that women face in the rest of their lives. The cries of misogyny come from tired frustration, especially at the usually poor representations of women's sexuality shown.
A modicum of sexploitation of a man is not a balancing of the scales that requires the intervention of men's rights activists to ensure men don't feel abused. Every other place is that place. This is the feminine space, regardless of the current percentage of menfolk making up our membership.