Did she tell you she is hurt? or she just walked off?
Neggin is suppose to be "accidental insults" so you don't have to acknowledge that you knew what you said is offensive, and I'd say yes, you should act as if you don't give a fuck. But I assume a push/pull would work better after negging!
You neg her and without giving her time to respond you continue talking, and in the mean time, analyze her body language and facial expression, if she seems annoyed, offended or hurt, you try to find that out and give her a small compliment!
If she does say that she is hurt and explain what you said is offensive and why its offensive, maybe respond with "oh I didn't mean it to come across that way" as Neg has done its job anyway, so you got nothing to lose and you could even carry it on with saying "oh did ya get offended princess? awww Im sorry" in a sarcastic/playful way.
What I found about negging tho is, it works best on hot, confidant girls more, so don't neg a shy, naive girl. They respond to compliments better in my opinion!
I could be wrong, its just my opinion on it
