The man has proven himself again and again to be a total narcissist. He lies about matters that don’t matter in order to do anything but concede a mistake eg. sharpie-gate, inauguration turnout, yada yada yada.
I do think there’s an argument to be made that these ridiculous statements – “nuke that hurricane!”– could in fact be constructed and planned by his team in advance so to keep media attention fixated on the crazy Trump show and deflect from any real focus on his denigrating policies. But, self deprecating jokes I think not.