all I can say is that some people don't know how to properly embrace 'sisterhood' and 'brotherhood'. Maybe that is a problem starting at whomever you talk to's DEAN or something.
Ideally, bottom line should be 'That's my Soror' or "That's my Frat".. wherever they are from... you might not every have as tight a relationship with them but they are Family nonetheless.
You also have to realize you are dealing with a lot of people who are YOUNG and still learning things about the world and themselves. Look at things in perspective Frat.