It's an interesting and emotive subject and one that can easily stray into racism which is a shame because good threads go astray and discussion becomes argument.
I can only speak from my personal perspective and a little from observations and conversations I've made and had with other WG's
Personally I have no issues with any race or colour, it has no bearing on my decision to accept a booking from a client, communication is my thing, I always find it odd and a bit sad when I get messages that say things like.
I'm a white male in his 40s or I'm black is that ok
I understand it because there are girls that don't see certain races and colour I just find it sad.
I live in the sticks in South Wales and so I see very few non white clients at home however I do tour to Chester, Bristol etc and there is a large non white population in and around those areas and tbh I love it, its one of the things I love about going on tour, its the variety I see, the last time I was in Bristol I saw at least 6, 25 to 40yo black males and every one was an absolute joy, the only slightly iffy booking I had was an Indian guy in his late 50s who was just a bit rude.
I have as yet found no correlation between race or colour and being a twat, I get just as many Caucasian guys pushing for BB, trying to go over time or being generally disrespectful as I do non white, in fact due to the general demographic of my clientele it's probably more prevalent in the Caucasian percentage of my clients than the rest.
I will add though that I have not toured in the bigger conurbations such as London, Birmingham etc
It would be interested to see if a higher percentage of the profiles stating no blacks etc were in larger cities that had a bigger ethnic population.