Negging is an act of emotional manipulation whereby a person makes a deliberate backhanded compliment ... to undermine their confidence and increase their need of the manipulator's approval.
A typical instance of negging is where a man deliberately insults a woman in a preconceived subtle way. Why do this? To lower her self-esteem and make her susceptible to him. For example:
You look like you're on a diet. That's great!
XKCD comic 1027: Pickup Artist
Question: How do I say "negging" in Chinese?
The only thing I've found so far is:
Also a popular phenomenon known as negging or offering a "back-handed" compliment which was meant to make a man look confident and self assured, was more likely to cause her to "run for the hills".
YouDao, attributed to bbs.51ielts.com but is no longer available
But it more accurately says:
In addition, there is one kind of popular trend, it is criticizing or mocking, it can appear more self-confident, but more possibly scares away the woman next to you.
So it's not much help.
(PS. Don't read too much into this question. I'm writing fiction.)