Maybe that definition is flawed or better incomplete. In my experience narcissistic people react highly allergic to having their flaws shown to them/their flawless self image scratched. They'll do everything do everything to gain a sense of superiority again, when i continued with logically correct argumentation they got enraged and in the end responded with violence. I learned my lesson though, me wanting to be right/winning the argument was an attempt to dominate the other person. Life is way more fun if i get along with others.