[Theory] I've always failed to see how "Narcissism" is negative

[Sassy Doll]

if we are talking about men then normie males dont believe anything about themselves, they focus on things that they can achieve

So, your definition of Narcissist is "someone who thinks they are extremely special, when usually they aren't, and when you inform them of this they become enraged."

That sounds more like a sensitive or unfortunate state; but the way they are spoken about, narcissists are painted as Harmful to others.

"How I'm recovering from dating a narcissist" etc.