Shotgun negs, Tease neg, and Sniper negs.
The first sort of neg is the shotgun neg, which is an innocuous statement that would only be uttered by a sincerely disinterested person. It's an indicator of disinterest. Of course, it's not that you dislike her; not at all. It's just that you hadn't considered her a potential romantic or sexual partner. This IOD diminishes her sexual power and disarms her peer group. The power of the shotgun neg is in its apparent sincerity. She'll honestly believe that you aren't trying to impress her. Then she wonders why...
The simplest example of this is pulling out a tissue and blowing your nose. She'll sincerely believe that you aren't trying to impress her; (otherwise you would never blow your nose in front of her.) It won't even occur to her that it's really just a ruse. Shotgun negs are useful for conveying a not-needy attitude — which is a demonstration of higher value. Thus in one stroke you indicate disinterest, disarm obstacles, and create attraction. "Nice nails, are they real?"
Contrast this with the tease neg. Teasing conveys a cocky, playful attitude. It's not perceived as inadvertent, but rather as deliberate flirting (but done properly.) Examples of this are "pull my finger," "You can dress her up, but you can't take her anywhere," 'Don't make me come down there," etc.
When you call her a dork, your cocky, playful, fun attitude shows confidence, takes charge, and makes tilings fun. Teasing stimulates her emotions and is useful as a DHV during A2. She may non-respond (IOD) to this tactic if she is trying to freeze you out.
Another form of neg is the sniper neg. An example of this is hinting to her that she has a booger, eye crusties, a sweat}" palm, or that she just spit on you. The idea is to make her honestly believe that she has performed a demonstration of lower value (DLV). This makes her self-conscious and creates a situation where she is the one wondering whether or not you have a good impression of her.