So we went out to dinner, and Jet had a root beer float.
When he and I first came home, we shared one of the banana muffins with cream cheese spread on it. He liked that and it was good enough for him that the float didn't make him run rampant the way some things can. He had some onion rings (new!) and fries with it.
At dinner, though, Jet was arguing like he has been for the last week or so. Everything was getting contradicted. In the car, John played with it and declared negatives on a bunch of things, that Jet then cheerfully and laughingly turned positive. So there is a way to "deal" with it, and I think we're learning, again.