Maybe they more hate them as a reaction to being told over and over that the purpose of a female character is to be the otherwise-undeveloped Love Interest And That's All Folks. I know I feel a stab of resentment when I unexpectedly encounter that kind of crappily written character in an otherwise-decent piece of media. it's like the creators of the piece are being all "This is what all women are or are supposed to be, so accept your limitations." With real people, it's so very much NOT the same thing at all, because those people DO have personality beyond making out with the pretty white guy male lead.