I think the drinking arguement is stupid. I have known SO MANY GDIs who drink as much or even far MORE than the greeks that I know.
Drinking is not a greek thing- it is a college thing. Good lord.
My bottom line- none of the stereotypes that people give about greeks can be limited to only greeks. There are just as many non-fraternity men who throw great parties, drink to the extreme, have vulgar language. There are many non-sorority women who wear big sunglasses (

) and polo shirts, and can't live without their cell phones. There are many non-sorority women who drink to the extreme, sleep around, and are bitchy and snobby to other females not in their "crowd".
I will say it again- these are not greek things- they are college things.