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I think you should neg her when she asks you of you are trying to pick her up. Something like: "No offence, but I don't pick up girls with your taste of shoes." or "No offence but I never pickup girls who have their hair dyed (black/blonde/...)." I think she will get so focused on the neg that she won't be thinking anymore at you picking her up but what is wrong with her shoes or hair.
I think negs are even worse than canned openers if you don't want to get called out.
Firstly, my problem with negs is that they demonstrate lower value - if you tell someone something bad about them it shows you are trying to bring their value down. Why would you want to do this is you had high value? Aren't insults a sign of insecurity? as jlaix says in his newsletter, a confident person is happy, and sees the good rather than the bad in other people.
Secondly, what applies to this guy's situation, a neg is a clear PUA tool and any girl who knows anything about PU will recognize it straight away. If you insult their shoes or their hair this is likely to piss them off so they will try even harder to make the PU difficult for you.