I've always heard this growing up and as someone who is biracial, I'd agree. I personally don't think there's anything wrong with it.
My mother was from Africa and although not actually strict by African standards, she would have been considered by Western standards. I wasn't ever allowed to hang out with friends as a teen if there was alcohol and couldn't have opposite sex sleepovers which many of my other Irish and English friends parents had.
The reasoning for this was "I'm strict because I want you to do well", but many of my friends with lax parents went on to do just as well if not become more successful than I was.