Ahh, the class system. As Reginald D Hunter puts it, it's a 'more evolved' racism. It's our way of discriminating against eachother.
So no, I am not part of your class system. Thank you.
Except that class has pretty much existed for as long as modern civilization, anything past the small communal phase, and is one of the fundamental forces that help to guide and organize societies. Racism is not a mandatory part of human life

.
The mistake nowadays when talking of class is to think in this post-Marxian way as always being essentially
antagonistic, which isn't necessarily the case at all. People tend to always become defensive when discussing class nowadays as if it is the same sort of designation as a racial slur - of course not! Many societies have a class system that actually promotes harmony. 'Knowing your place' isn't necessarily oppressive or insulting; it can just as often be the opposite, and help you to lead a fulfilling life, with a sense of value in your society.
I've said this before on the class debate, and whilst we're here on the high-minded theory and pontificating step... i think the reason that there is a huge anxiety about class nowadays (particularly in the US and UK), is because the logic of advanced/late capitalism basically implies that anyone of a lower class is a mediocre or 'failed' person. The ideology of exceptionalism - originating in America and imported wholesale over here - the rabid promotion of individualism (and the lies of total fluid mobility that go along with it): all create a system where anyone
not seemingly grabbing their slice of the American dream is an abject failure. Call it the ideology of
unexceptionalism, if you will: rich charismatic CEO's are the modern-day heroes, working-class people must be idle and thus contemptible. Of course this isn't true, we have just invented a system and a superstructure/culture with it that defines you by material wealth, what you own, how much your paycheque takes home, etc. whilst completely forgetting that society would collapse if it wasn't for the people at the bottom doing the menial tasks and being happy with their lot.
I think that's where the stock-phrase "and proud of it" comes from. Before capitalism started implying that the working-class were idle brutes, working class people enjoyed a rich heritage and tradition of their own - think brassbands, male voice choirs, working men's clubs, etc. They may not have been all thrilled with their place in society, but they had a strong sense of identity, pride, and
belonging. Nowadays we have alienated the lower classes, and the class issue becomes essentially antagonistic again. It riles people. Silly, imo.