Well yeah but then if I take the logic of this further if you enter a discussion with the belief that you are never wrong then you will learn nothing, do this enough times and you are actually foolish do it consistently and over your lifetime and your a clown.
Few people are arrogant enough to assume they are never wrong, I do have a friend who was like that though, he just would never admit he was wrong it's like talking to a brick wall, people are wrong all people: it's not a bad thing to hold up your hands and say 'I am talking arse ok I admit it' in fact if anything it makes you more human. How dangerous is always having to be right to the psyche?