Speak up or bite my tongue?

[adpiucf]

I guess my question is, why do you care? I do think that sorority women should mind their P's and Q's in public, but that's why they have standards programming built into their membership education program.

If you encounter this again, go up to the girls and say, "I'm a sorority alum from another school and I couldn't help but overhear you bashing the other chapters here. I'm really disappointed and I felt so strongly that I needed to say something-- the way you are talking right now has left me with a very bad impression of your sorority, not the others. I am sure you are all better people than the way you've just portrayed yourselves. Please watch what you're saying in public and please be Panhellenic. Thanks for letting me get that off my chest."

I don't think you need to go reporting them to anyone.