Of course it's true! For example, how many pure asian girls do you know who have curly hair? I know none. It's all about genetics, I know, shocking! Curly genes are more common in certain ethnicities. It is not a stereotype or generalization, it's a scientific fact.Both of my parents are Acadian French, neither of them have curly hair, but I have majorly thick hair filled with 3b curls.
I don't think that it's true that certain ethnic backgrounds make someone more prone to having 3b curls -- but I do think that a lot of people think so... I'm about as white as white can be, blonde hair, green eyes, and I still have people ask or just assume that I'm mixed. It doesn't bother me, but I think it's funny