I agree that first-hand experience does alter a person's perceptions. I face a similar mountain with my Mum, but she seems to be acclimatising to my particular case, at least.
Though I don't think she would say such a thing in public, she's often remarked upon people on TV; often women with short hair, dressing in jeans and a t-shirt. She seems rather ignorant of a few common sense ideas, not least of which is the right to personal expression. I do what I can to politely but sternly point these things out, and try to reel it back in to my own circumstances too, as she knows some of what I'm going through. I fall just short of pointing out that she often wears trousers herself - there's nothing like attacking a person to make them withdraw even further.
Best of luck in coaxing your mother out of this. Dealing with ->-bleeped-<- usually makes us better, more empathetic people, and I think the same can be said for those around us, in time.