In my experience, the problem with most self-appointed Human Factors Experts (and we know the definition of "expert", do we not?), apart from their insufferable holier-than-thou attitude, is that they totally overlook the fact that the rest of us are members of the human race and understand the principles they are expounding perfectly well - when they are not wrapped up, that is, in a liberal coating of b*llsh*t.
What they are experts in most of the time, as with Sybil Fawlty, is the ability to state the bleeding obvious.