Why do people need to meld their ego with some nebulous "classification"? Like yo I'm black. Yo I'm white. Yo I'm asian. In reality, all humans are a continuous spectrum based off of groups of people that evolved in certain conditions over thousands of years. What does a "white" person from Ireland have in common with a "white" person from the Caucuses? What does a "black" person from Sierra Leone have in common with…
Because membership of a group, especially for marginalised and oppressed peoples, is a way to have shared strength and be able to relate to others' experiences and protect each other. Which is an incredibly powerful and necessary until the world is significantly fairer. Also in the case of barbers, it is plainly obvious: Experience working with hair of a certain type.
Aka get rid of the simple descriptors of "white" "black" etc since they mean very little or nothing at all.