this thread's a bit ridiculous - try finding any university in the top 30 or so which doesn't have rahs, toffs, sloaneys, chavs, goths, nerds, gays, lesbians, heterosexuals, tramps etc.
every decent university is likely to have a complete cross section of stereotypes of the 18-23 age bracket.
my experience at birmingham though was that it isn't nowhere near as sloaney as other universities might be. 99.9% of the people were normal and down to earth.
there was one rah girl in our year who brought a hamper of champagne into the mason lounge (IT suite in arts building) to celebrate with chums after handing in her dissertation. everyone who was there pointed and laughed; those who weren't heard about it and laughed. that sort of stuff is the exception rather than the norm at bham.