I think the whole get a life thing, is NTs expecting everyone to get their concept of a life. Those of us who are still in touch with our inner child, have a life that they can't have, and are jelous of. So telling people like us to "get a life" is their way, of trying to pretend that their life is anything that special.
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"Sprinkle, sprinkle, little bar, what I wonder is a cat" - Cheese from Foster's Home for Imaginary Friends