This strikes me as Jewy semantic bullshit. Why should I accept your definition of an "ism"? It's just a etymological artifact that communicates we're talking about an abstraction, the same as -tas, -tatis 3rd declension nouns (libertas, dignitas, nobilitas, e.g.) from Latin get rendered with an -ity in English (liberty, dignity, nobility). Narcissism is an abstraction of the story of Narcissus. To argue that narcissism is a negation of the self because is has "-ism" in it makes no fucking sense to me.