Note to self: You cannot win an argument with your dad who has dementia. You. Just. Can’t. And you are an idiot to even try to go down that road. It so doesn’t matter if you are right. The dad in question is your dad, and he is rocking the kasbah as hard as he can, to the best of his ability. On occasion, he may unfairly lash out – there is much beyond his control, and sorry, but you have to eat it and apologize, because that’s what you do for rock star parents.
Bonus: He will not remember that he got mad at you, so you get to start over with no weirdness. Silver lining, people.