You appear not to have read the part of my comment where I explained that Mystery Method is heavily about quickly befriending groups of strangers and getting them on your side.

Ok, yes, that does sound like a generally useful skill, and I was not aware that some of the things you cite were part of PUA material.

But none of that is what was originally cited by the OP. What was cited was the drink-buying thing, something which just sounds positively wacky to anyone not committed to the PUA ethos.

If he'd cited an example of something like what you're talking about here, I don't think anyone would have had a problem with it.