GUYS:I noticed something very interesting, and I just don't understand it.?

I was out an about with my good friend this weekend. We went and hung out with her guy friend for a couple nights and partied. She always drags me to hang out with her and who ever is her current flavor of the week. And I notice each guy she is with she is really rude to. Yet they all just swoon over her. Granted, she is a pretty girl, but she is still a kind of a ***** to guys. Why would any guy want her? I just never understand. Is this what guys like?