People deny what they don't know

Some people pretend to know everything - even they have no idea about subject. I agree to following saying "The more you know the more you realize how much you don't know, the less you know the more you think you know." Actually, I am not smart and clever but not stupid. Sometimes it is really difficult to talk to someone who is trying to look like wise. If anyone accidentally says just one wrong, these arrogant guys catch the mistake and correct it. That's ridiculous. I personally prefer humble to arrogant.