I also get that question as well, then the follow up question "how do you get it to curl like that?".
I am a person who likes my space and does not like being touched by strangers or without consent. I have batted away many hands that have tried to touch/yank my hair, then the people stare at me as if I'm the rude one.
If i don't batt hands away physically, I say "Please don't touch my hair" in a polite but firm tone, and they still look offended. It's an eye-roller really.