I think Ego reads about some "new" idea, and gloms onto it before thinking it through, but he's a stereotypical stubborn teenager, so he goes along with it until the discussion dies down or his attention is directed at some other "new" concept.
I wouldn't be a bit surprised if he was a thirty-year-old trying to pull off the teenager version of Poe's Law.
I wouldn't be a bit surprised if he was a thirty-year-old trying to pull off the teenager version of Poe's Law.