A lot of you girls are way nicer than I would be! I haven't had a lot of bad comments about my hair (at least not to my face), but I don't play around with that stuff. I would just say:
"You have a problem with my hair, because you have a problem being black. I don't have the same problem, which is why I love my hair. But it hurts to be insulted by someone I care about. And if you care about me and my self-esteem you won't make these comments anymore. So if you keep trying to tear me down, then that just lets me know how much you really do or don't care about me."
People will rationalize all their bad behavior away because they have your 'best interest' in mind. Sometimes you have to straight up tell them that they are embarrassing themselves with their ignorance.