How many white actors, of any class, do you see in adverts on tv now? It's certainly not representative of the white population in this county. It doesn't worry me greatly but let's not pretend that discrimination is all one way. It most certainly isn't.
If she was black and attractive, I'm sure she would have got the same level of publicity given the circumstances. Long gone are the days this country when being white and middle class offers you any sort of advantage; and even if it did I see no reason to apologise for it.