I don't know, I don't see how the chick is a slut for talking to other guys. It's not like you all came to the club together, and it's not like she's dating your friend. Were they supposed to sit there and talk to you two only? That's pretty awkward. You guys don't even know each other.
What would you say if she was dancing with another guy? Whould she then be classified as a "Super Whore"?
If I met up with some girls and they were kinda lame or just didn't do it for me I'd talk to other people too.
Plus, if some guy were to go up and talk to those girls, should they just ignore him?
BTW I'm not trying to sound like an asshole.