A Narc has no empathy. This means it is all about self. That means they don't do stuff to needle you at all, instead they are totally unaware you have feelings at all and are just looking after self. Therefore don't take it personally, understand what you are dealing with. What he means by drop your ego.
Emotion won't work on a narc, but logic will. Because they are focused on self only, use their vanity against them. You can manipulate them this way, out narc them at their own game.
Their memory is shit, can have fun with that too. Don't get sarcasm or subtleness so be animated with them when communicating.