As far as I can tell most people who dislike PUA techniques don't really understand them.

Most people here don't understand them because they have this model in their mind that if you treat an attractive woman nicely, try to respect her desires and needs, perhaps compliment her, with the internal attitude that women should be "respected" she will respond in kind by respecting your desire to have sex with her.

They never test this model by going to a bar and trying to use it to achieve the goal of sex with an attractive woman. I know this, because if they had tested it even 3 nights in a row, they would have discarded it as "broken". I would love to go out into the field with 10 guys from LessWrong and alicorn to coach them, and watch them get rejected time after time by attractive women.

I would write a top level post explaining the techniques, the PUA model of the generic male-female interaction, the predictions it makes, and how you can go out and collect experimental evidence to confirm or disconfirm those predictions, but I think that I would not get promoted (no matter how good the post was from a rational perspective, measured in bits of information it conveys about the world) and not get much karma, because people here just don't want to hear that truth.