As curls don't seem to be such a big deal in Germany I don't get many rude comments, but I got two examples anyway.

girl at a party: "You look, like you got a bird's nest on your head"
Okay, she was annoyed, because her boyfriend looked a little bit too long at me.

My boyfriends mother, when I was a teenage, when he was wondering, what he could give me to my 16th birthday: "a brush"
Okay, that was before CG and my hair was really long but very frizzy then. I was hurt anyway