Talking to people who behave like they know everything can be quite frustrating. You probably think that acting like a know-it-all will leave other people captivated by your wisdom, when in reality, it will only make them roll their eyes. An urge to demonstrate everything you know indicates that you are showing off in order to hide your insecurities.More importantly, those who have all the answers are usually perceived as manipulative and threatening, which can’t be attractive.