A lady does not have to be racist or prejudice to not want to see black men as clients.
Understand these ladies have the freedom to pick and choose who they provide services to.
I perfer Asian girls, that does not make me a racist even though I do not date any other race or color. It is personal choice, I am not generally attracted to black or white ladies for that matter.
Further when it comes to 'working' girls, thier own person experiences will form their opinions on which clients they feel safe with. Who are you to judge or through out a racist lable on someone who may have had a bad experience or several with some men and has decided for her own safety not to risk any further contact?
There are good people and bad people of every race color and creed. Lets not forget that, but you have to know it is a seller's market, and they do not have to do anything with anyone they do not want to.