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).
I have recently been corresponding with a friend who studies psychology regarding human cognition and the best underlying models for understanding it. His argument, summarized very briefly, is given by this quote:
I am having trouble synthesizing a response that captures the Bayesian point of view (and is sufficiently backed up by sources so that it will be useful for my friend rather than just gainsaying of the argument) because I am mostly a decision theory / probability person. Are these works of psychology and neuroscience really illustrating that human emotion governs decision making? What are some good neuroscience papers to read that deal with this, and how do Bayesians respond? It may be that everything he mentions above is a correct assessment (I don't know and don't have enough time to read the books right now), but that it is irrelevant if you want to make good decisions rather than just accept the types of decisions we already make.