Considering that some degree of narcissism is part of everyone's psyche, using it as a label and associating it with extreme cases makes it close to an epithet. I have no doubt that many of the people one might see as extreme or "obvious" narcissists might have the same opinion of those who use that language. It's nearly comical at that point.
Narcissism is something that normal adults grow out of, although they can still act childishly _at times_. But for some people, the growth never happens at all.
