BU = BE YOU. This is taken quite literally, and you'll see a little bit of everything on campus -- gays/lesbians/transgendered, punks, preps, snobs, anime, Euro, blacks, whites, hispanics and literally everything in between. This makes for a rather liberal atmosphere.
As I mentioned, SMG kids are snobby and think they have the best program at BU -- really they just have the best building. The SMG sluts, as I like to call them, are some of the most obnoxious people on campus.
The thing about BU, however, is that even though there is a huge number of obnoxious, rich, fake-tanned, Mac-using, Starbucks-drinking, New Yorker/ New Jersey-type people here, there are also thousands of other people that you can meet. The size really allows almost anyone to find their niche.