One of my exes went so far as to write anti-Greek articles for the school paper - well, I guess anti-Greek is a bit strong, but basically lampooning the system. Then he met my sisters and me and he had to eat every word with ketchup, mustard & pickles.
We were just so different from what he thought the stereotype was he couldn't believe it. I think he ended up spending more time at our house than half of the sisters.