Well, I think this claim is more often made 'by omission'...you know, if you've known someone for, say, 10 years, on a daily basis, and they have NEVER (and I mean that literally) uttered the words "I'm sorry", "I was wrong", "Please forgive me" or any combination thereof towards you or anyone else, its pretty obvious that they have an infallibility complex (also demonstrated by excessive judgementalism...)