I honestly and sincerely believe that the feeling of insult is more of an invasion of territory than an actual offense and, as such, has more to do with cultural notions of gender boundaries than anything else.
Reading on the board, a lot of SOs seem to get really irked if their CDing partner shaves his legs. I have also been in a relationship with a girl who was semi-supportive but when I shaved my legs once she said, "Don't do that again." This is kind of a case in point - body hair is a pretty personal thing. I figure that (and I realize this is a pretty odd parallel), just as many women (and men, including myself) demand abortion rights because they want control over their bodies, men should be able to control their own bodies to the extent that they should be allowed to decide if they want hair growing on their legs or not.
The real "problem" is that it treads into feminine territory - not that it mocks or degrades women in anyway. By shaving your legs you are participating in a time-honored tradition of that GG, her mother and all the women in her life. They shave their legs. They complain to each other about razor burn. They joke about how they haven't been shaving for a few days so they have hairy man legs and need to wear long pants to hide them until they get around to shaving them again. You enter into a world that the GG views as "women only."
So, I don't think it's that CDing necessarily degrades or puts down women (obviously if done with bad intent, anything can degrade women) it's just that it kind of tampers with the feeling of exclusivity that many women associate with all things feminine.
