Any woman who’s been to a sleepover with girls of different races and ethnicities can tell you that there are some significant differences between the hair of various types of people.
I happen to be a woman with straight hair - stubbornly straight hair, I might add, with folicles that laugh at curlers, hairdryers, and once even shrugged off a perm - who, at times, wears multiple braids. Comparing with women who have typically “African” hair, my hair is MUCH harder to put into a neat braid and it tends to unravel over the course of the day. Indeed, I’ve heard gasps of horror from such women over the notion that when I wear multiple small braids I must re-braid my hair every day. Because it just won’t stay in the braids overnight.
Black women who have tried braiding my hair also have many complaints about it - one of the reasons those black women can “bang out” hairstyles so quickly on their children is that their hair tends to stay where you put it - mine slithers away (yes, that word was used once).
On the other hand, nappy hair can stand up and do things my hair will never be able to do no matter what chemicals, gels, and mousses you goop into it.
Different hair lends itself to different styles. Even “simple” styles can be surprisingly difficult to achieve. A “simple” blunt cut, for instance, takes some precision to achieve a neat and tidy edge, and for the hair to fall properly into place. If it’s long it may also require some awkward stances on the part of the stylist because most stations are set up with the idea that hair is relatively short. Getting a proper blunt cut on waist-length hair may require the stylist to bend over, kneel or find a low stool to approach the problem from the proper angle.
Some of the hairstyles sported by the sisters ARE quite complicated, take time and skill to do properly, and probably are worth more than certain other hairstyles. But that has to do with the work involved - there are other black hairstyles that don’t require as much effort by the stylist and should not cost more.
Putting just a wave into Asian hair can be just as much a struggle as cornrowing a blond European or straightening African hair. I can see that a person might specialize in certain techniques for a particular type of hair, and that that type of hair may tend to be found in people of a particular ancestory. I would not be surprised if I walked into any random salon in, say, Kenya, and was told “the woman who does white hair isn’t in today”. Would that be a bigoted statment? It depends on the context. Did I ask for a hairstyle/treatment not normally used on most of their clients? Or for for something simple and common to just about everyone? If my sister, who has extremely curly hair, walked into a salon in Tokyo, would she pose a problem to hairdressers used to naturally straight hair?
Here in America, with so many different ethnicities, plus all the folks of mixed background, a hair stylist needs to be familar with just about everything. But charging someone extra just because they’re black is out of line. Yet, as is typically with these sorts of stories, we don’t really know all the details. Could this be a case of bigotry? Sure - and I’m positive it does happen. But I’m not sure it happened in this case.