What a ridiculous thread title, clearly the middle-class dominates almost everything worth domnating that is respectable! There's no point exaggerating the situation.
But I agree with its central message I go to a private school and get a similar sort of reaction 'posh' blah blah. Obviously people don't like to feel that you're somehow better off than them even though many parents merely struggle to make ends meet.
I'm not trying to provoke a resposne but, what I can say is that pupils on average who go to private schools, actually work a lot harder than their state school counterparts, and it shows.