>>110325784Morty's 14, so of course someone like him would be all too easily tempted to invoke Godwin's law at a point where he's emotionally raw and upset. Also, he's in doubt of his own statement, with the "or something" at the end.
You're not supposed to laugh at the dialogue on its own, you're supposed to laugh at the subtext of Morty tripping over himself in his state of pain and anger.