What does this mean when a girl says this???? girls only?

I really like this girl at this party and was trying to talk to her. She turned around and said, "Rob, I really want to sit on your face and fart, would you let me?" Of course I said NO, her friends and her laughed and I went to talk to other people...my question is: What does that mean? I know its like she's dissing me but want your opinion on what the message is!!