Echoing other comments, it seems important to understand what your friend means by Bayesianism. There is a specific school of psychologists called "Bayesians" who try to model human behavior using Bayesian statistics. Without knowing anything else, it seems likely that this is what your friend thinks of when he hears the word "Bayesianism", so the evidence he pointed out would indeed be strong evidence that the Bayesian school in psychology will not be able to fully explain human behavior without significantly modifying its methods (note however that Bayesian techniques could still be fundamentally important for modeling certain aspects of human behavior, see for instance RichardKennaway's links).