Lots to unpack here.
You still do not explain why white people's relationships with their barbers are less meaningful just because the color of their skin.
Also I don't get why a person with white skin could not go to a barber who has black skin, which would know how to cut white hair because as you said it's the default, and build a great friendship and community there.
Where I live most white people go to PoC barbershops because most barbershops are own by PoC overall.
Black people and white people are allowed to be friends and to go to each others business now.