To me, the "know it all" concept smacks of narcissism, and as such, I am a bit taken aback by the attitude that one is wrong for reacting adversely to such a person. Then again, this is my own personal experience with know it alls, The narcissistic know it all WANTS you to feel wrong. They want you to change. They want you to feel inferior to them. Having grown up with 2 narcissists, I refuse to bow down to their behavior.