And yes I do agree, I think that (SADLY) a lot of people especially in the Hispanic community it seems, somehow attach curls to the African American race only, something that is incredibly ignorant. Unfortunately a lot of guys I've met that are Hispanic have pre-conceived notions about curls and they believe that based on what they've heard from their families being "black" is a bad thing?
I know this because I was born in the Dominican Republic, my family however is from Northern Spain and I was raised in the U.S. I'm from all over the place and was never raised with any sort of prejudice or complexes about hair, as a matter of fact growing up I didn't know there was really a difference between straight hair or curly or wavy, I just never thought about it to be honest. But after encountering a lot of Hispanic people I realized most views were very different from mine.
I've noticed that in DR most men if not ALL will NEVER date a girl with curls because that means she must be mixed with African, and in Dominican Republic a lot of people attempt to be as "White" as possible? Whatever that means. So you see women relaxing their hair every weekend at the salon and if you want to find a man, you're not going to with what they call (pajon) or "giant poofy mess" in English. In a lot of Hispanic communities the men's goal is to get a "white" girlfriend, or one that at least sort of looks white, so being curly haired and tan isn't the best thing I guess.
I am mixed with many races. so I don't think curls only come from Africa since there are women and men from all over the globe with curls and textures. But like you said, I do find it quite racist for guys to make comments like that about curls because the majority of the time I feel it does have some underlying pre-conception or assumption about a specific ethnicity, be it African or any other.