They might have been operating under the "better safe than sorry" principle if the person you talked to was in a sorority and you didn't know it. But even if you as a rushee (I'm assuming you're a rushee) would talk to someone in a sorority, nothing happens to you - it's up to the sorority member to enforce the silence period and just let you know she's a sister.
So if people seem standoffish or snobbish for a day, don't take it personally!
