In defence of the SP's (I've had friends who were pros and have a bit of an insight on their biz), some brown people are notorious in the SP world for going beyond boundaries (some asian groups have been labelled that way too, and some caucasians have been labelled unruly, aggressive and rude by some of my SP friends who mostly service asian clients).
There are cases of individuals wanting gang bangs for the price of the hour, there are those that try to visit greece when it has not been permitted, some clients are too aggressive and man-handle the women and often there is haggling to drop the donation price even though the rate has been pre-determined and agreed upon (or trying to extend the time without paying or get freebies without consideration).
The SP in question might have reacted due to bad experiences with other brown clients, or she might be prejudicial and also had a bad day resulting in the rather rude response.
Of course SP's are people too. We all have likes and dislikes. I don't like to visit SP's with skin darker than myself. You can call me a bigot but it is just my preference (this rule stands for me when I date too).
While I can be selective without outwardly showing my prejudices towards an SP, an SP often does not have that ability.
Just because you are going to pay for her time, doesn't mean that she wants to play with you or has to play with you (nothing in the the bill of rights about that). It is not like you are going to a restaurant and being refused service!
Intimate play is a totally different thing. Just like nobody can force me to date or sleep with a chick I don't like, SP's should have the right to choose as well.
In any case, while some SP's have a problem with race, there are tons in my experience who don't give a rats ass what color you are. So, just like dating women, if she doesn't like you, it is her loss, so move on to the next one.
Besides, you are trying to screw her, not date her nor keep her, so what do you care if she is a bigot?
Reality check, everybody is human and has some prejudices that's one reason why people fight wars. Anybody who denies this is just lying to themselves.