Think your reasoning could be a little twisted there Grom's. It wouldn't happen because they're educated and wealthy no. Although they could afford a better brief which might help and is another thread in itself.
It's perception that's at the root of it. If someone is presentable, has the gift of the gab etc... then yes, they will be percieved differently to someone who is percieved as 'chavvy.' It's a cultural snobbery that we're all guilty of in one form or another; inverted snobbery is just as bad.
Whether we try to hide it or not, our perceptions do lead us to treat others differently in everything we do. Whether it's someone up in court or even as simple as a pixel on the net. (Think about it, do you treat all pixels the same or do you have the perception that you might not get along with/find some beyond irritating/class them as stupid? Where does that come from? It's not based in fact. That kind of thinking is applied in all walks of life).
So therefore, if we percieve someone to be 'just like us' then it's all the more horrifying that this person could be guilty of something that we find detestable. Why? Because we see it as a reflection on us. And as a result, whether we like it or not, we treat them differently.
IMHO anyway.