No idea whether there's a cultural element too it or not, but i've found 'negs' and stuff to be pure suicide on hot young UK girls (ESPECIALLY at around the open which is actually when mystery recommended to use them. I think they're at least 'ok' once comfort is built, but that's teh opposite of what mystery said to do).
I can see it 'working' if she is very attracted to you, but then, anything will tend to work if she thinks you are hot
But a neg, especially at the open, just gives the girls an opportunity to look you up and down like you are a dim-witted, smelly peasant with no social skills, and then tell you to go away. And not in a '$hit test' kind of way haha. It doesn't 'make them chase' like mystery said
(ps - I don't know how many of you have seen his full infields from his courses, but they're quite painful and far from impressive. I'm not sure why people ever listened to him!)
A typical infield, shot back when he was actually a fairly decent looking (and very tall) guy with good social proof, was basically him clearly boring the a$$ off of girls who were older and not as good looking as him, with his 'dhv stories' and just coming across as odd and eventually possibly getting a phone number or a kiss. He could have got much better results with just going caveman and never thinking about 'game' at all!