From that website I mentioned:-
Narcissists are (a) extremely sensitive to personal criticism and (b) extremely critical of other people. They think that they must be seen as perfect or superior or infallible, next to god-like (if not actually divine, then sitting on the right hand of God) or else they are worthless. There's no middle ground of ordinary normal humanity for narcissists. They can't tolerate the least disagreement. In fact, if you say, "Please don't do that again it hurts," narcissists will turn around and do it again harder to prove that they were right the first time; their reasoning seems to be something like "I am a good person and can do no wrong; therefore, I didn't hurt you and you are lying about it now..." -- sorry, folks, I get lost after that. Anyhow, narcissists are habitually cruel in little ways, as well as big ones, because they're paying attention to their fantasy and not to you, but the bruises on you are REAL, not in your imagination.
Thus, no matter how gently you suggest that they might do better to change their ways or get some help, they will react in one of two equally horrible ways: they will attack or they will withdraw. Be wary of wandering into this dragon's cave narcissists will say ANYTHING, they will trash anyone in their own self-justification, and then they will expect the immediate restoration of the status quo. They will attack you (sometimes physically) and spew a load of bile, insult, abuse, contempt, threats, etc., and then well, it's kind of like they had indigestion and the vicious tirade worked like a burp: "There. Now I feel better. Where were we?" They feel better, so they expect you to feel better, too. They will say you are nothing, worthless, and turn around immediately and say that they love you. When you object to this kind of treatment, they will say, "You just have to accept me the way I am. (God made me this way, so God loves me even if you are too stupid to understand how special I am.)"
Accepting them as they are (and staying away from them entirely) is excellent advice. The other "punishment" narcissists mete out is banishing you from their glorious presence this can turn into a farce, since by this point you are probably praying to be rescued, "Dear God! How do I get out of this?" The narcissist expects that you will be devastated by the withdrawal of her/his divine attention, so that after a while a few weeks or months (i.e., the next time the narcissist needs to use you for something) the narcissist will expect you to have learned your lesson and be eager to return to the fold. If you have learned your lesson, you won't answer that call. They can't see that they have a problem; it's always somebody else who has the problem and needs to change. Therapies work at all only when the individual wants to change and, though narcissists hate their real selves, they don't want to change they want the world to change. And they criticize, gripe, and complain about almost everything and almost everyone almost all the time. There are usually a favored few whom narcissists regard as absolutely above reproach, even for egregious misconduct or actual crime, and about whom they won't brook the slightest criticism. These are people the narcissists are terrified of, though they'll tell you that what they feel is love and respect; apparently they don't know the difference between fear and love. Narcissists just get worse and worse as they grow older; their parents and other authority figures that they've feared die off, and there's less and less outside influence to keep them in check.