on my campus, I tend to hear a lot of GDI's and people who just don't know any better call fraternities "frats." We try to correct them whenever possible, because to a lot of us, "frat" just applies to the stereotype, whereas fraternity shows more respect. And the majority of the fraternity guys I hang out with deserve that respect. (though we do have the exceptions, as I'm sure happens on every campus)
Heh, though it's not to say that we don't poke fun of it, and of ourselves. The Delts on our campus are one of our strongest chapters, and there was the day they decided to put up the volleyball net OVER the slip-n-slide and decided to play volleyball. We kept joking that they were "taking the 'ernity' out of 'fraternity.'
~Holly