I was watching a documentary once, and this black prostitute was saying the reason she doesn't like to see black guys at least in the UK, is because the black community is small, so there is much more chance she will be outed or blackmailed. So it is not always to do with racism. Have to remember as well that ho's even in countries where it is legal in certain circumstances in the UK, are operating on the fringes of legality, and it attracts all sorts of bad people of all races, so you may have to make split second choices about people, that in another walk of life would be seen as discriminatory, but even these days the police look down on ho's they rarely have anyone looking out for them apart from a self interested pimp at most, I can understand why they think like they do. It's not just black dudes they turn down, they turn down indians, hell people of all races who seem a bit nervous on the phone, they might just not like the look of you from the security camera when you walk up to the door and just not answer . It's about survival on these mean streets, have to remember how vunerable women are to a man in an enclosed space. It isn't like hollywood you know with women able to kick a mans ass.

cuz prostitutes are clean and disease free
It's a business thing
. Black escorts even wrote blogs about why they don't see blacks and it had nothing to do with race.