The trouble is that Feynman learned the wrong lesson - a failure of epistemic rationality. The lesson learned should have been "do what the successful guys do," basically - that night the MC told him what to do, and he did it, and he got laid.

There was more than that to his hypothesis, though. This extra part, which may be just a teeny bit problematic to feminists, was that it was important to think of the women as "worthless bitches" while you were doing this. This extra part was not tested, yet still gets reported in the story as if it was a good idea.