Pretty sure plenty of white folks go to black barbers, and plenty of back folks go to white barbers.
Yeah, and that shows your level of ignorance here. Cosmetology and barber schools don't teach about black hair types and difficulties. White is default in these places and black hair care is considered a "specialty" skill. A black person can't just walk into any barbershop. Well, they could but it's unlikely anyone knows how to help them.
I have to be done here, but this is definitely a blind spot for you. Maybe look into it?