I just read the Wikipedia article not the myth itself so take it for what it is.
Getting all bent out of shape because of someone using a word that, since ancient times, meant some form toxic self love is silly at best.
Skimming through the wiki article I see more than one interpretation of the myth. An Ovids contemporary gives an interpretation of an asshole who rudely reject everyone and for being an asshole Narcissus is punished.
Yes, Ovid might have depicted the guy differently; no, I don't know the texts myself.
But the colloquial meaning of the word is a self absorbed asshole. No matter gender or sexuality.
At the end of the day we are talking about a myth that was interpreted and reinterpreted through time by many people and even became term by itself no longer attached to the myth at all. The myth is nothing more than a fun fact and should not be treated as adding extra meaning to every usage of the word.