Honoring the old times, let me introduce myself.
sezamus, 31, ex-military, engineer earning top 10% salary in my country. I have my own flat, car and... 30% body fat. Yes, I got back to my gym after almost a year.

I have a friend, former bikini-fitness model. ~5'9", great shape, great boobs, very nice personality.
One day we were coming home from a dance class and she was telling me how some guys there were sometimes rude beyond comprehension.
A sperg, who got to know some PUA technique called "Neg" (I believe you are familiar with it), used it like that:
Her:-Hi!
Sperg:-Hi... You're fat!
Then, she told me how cringe it was and never wanted to see that guy ever again.

To my surprise it is not the first time, I hear about misuse of neg.
Once I was on a date with a beautiful young woman (23), who knew how pretty she was and what effect it had on men. During the talk I complemented how nice outfit she had worn for me. She smiled, asked "where are you looking at? Eyes up here!" in a teasing way and told me, that some guy who had tried to go on a date with her also had thrown a spergy neg like "oh, you are not pretty sitting that close". Of course the result was the same. She never wanted to see that guy again.

Both that girl and my friend said the same: "Men became rude lately!"
I know why. It was inevitable. They had read it about it here or in some PUA community, but understood it in an absolutely wrong way. Guess what? I made that same mistake many years ago. I called a pretty girl "a witch". She didn't take that well.
Guys, seduction is not about being rude.
The purpose of an accurate neg is to create playful teasing, to joke, show self-confidence after you have some rapport with a woman.
E.g.
Her: -Last weekend I did this, that and...
-(I pretend to fall asleep) Oh yeah..., so interesting! I think I left the iron in the oven, bye!
-Oh come on! What did you do?!
-Cool people stuff. You wouldn't get it.
But! All this in a playful, smiling manner. A neg should first of all be a playful way to set comfort. Yes, comfort, becasue a thirsty man shooting complements all the time is the opposite of it.