Hammertime- Yes mate its cool if it works for you. Negging alone has never worked for me, what I like to do is double it up with a compliment, sort of a push-pull neg "You're like a herd. You know...a hot nerd" or "You're quite quirky arn't you? I like that"

Hustler25- You missed a good night in Cheltenhams on sat dude! You were absulutely spot on about the quality of girls there.