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A person said something along the lines of egoism being destructive.

An obnoxious commenter replied "look up definition of egoism vs. egotism", so I did.

I thought they were synonyms, but turns out they're ... pretty much synonyms?

Can anyone help me understand what Obnoxious Commenter might have meant? Why would the meaning of "egoism" undermine the message that short-sighted selfishness is destructive? but "egotism" would make it work?