I was slightly unsure of this myself. In MM he uses certain examples of negs that are 'backhanded compliments', the use of which was to generate attraction by showing her that you have the power to say 'you ain't all that bitch'. Other negs were ones like 'you can dress her up but you can't take her anywhere', which are funny (nae scripted) comments. This to me would be a bit more teasing-like. I can have fun naturally teasing girls, but I can also push it to the point when I can see it's slightly hurting them, and not quite as fun. Maybe it's effective, maybe not, but it actually hurts me to keep doing it if I'm bullying them into submission, although admittedly in occassion I don't know when to stop, particularly if you can't stop thinking of sharp comebacks!

Generally, girls can have a 'bitch shield' sometimes, but if you have a strong, fun and unshakeable mentality, they will soon be forced to crack a smile. This is the principle behind negs and teasing.