I am just not a big fan of the Greek organizations and I think that it says something about the kind of people who are in them.
Most Helpful Girl
While I understand where you're coming from, I don't think it's particularly fair to make a complete judgment of people based on their affiliations. While I know plenty of sorority girls who are perfect sorority stereotypes, I know just as many who I would never have guessed to be affiliates.
So, I guess while it doesn't make you a bad person to avoid sorority girls (to each their own, you know), it would be a bit less acceptable if you meet a girl, decide you like her for who she is, then find out she's a sorority member and dump her.0