I grew up with a narcissist too, and a surefire way to make such a person fly into a rage is to tell them precisely "the world doesn't revolve around you." I have a talent for pissing off narcissists, even when I don't mean to. The momentary pleasure of flushing their proverbial toilet is seldom worth the grief I get in return.

Narcissists are compulsively defensive, fight every battle that they can, and nothing is over until they win; normal people tend to give up on lost causes. I think what @edystringz is trying to say is "don't be like them, not every battle is worth fighting."