Assuming the interlocutor is stupid, at any scale, 1-1 to the whole of american politics probably just highlight that you don't fully grasp their point of view, because then it wouldn't be stupid. You'd be able to explain it to them and get them to see the matter from your perspective. If you can't do that, then you don't know you're right, you might be, but there's no way for you to know, truly.
Assuming the interlocutor is stupid, at any scale, 1-1 to the whole of american politics probably just highlight that you don't fully grasp their point of view, because then it wouldn't be stupid. You'd be able to explain it to them and get them to see the matter from your perspective. If you can't do that, then you don't know you're right, you might be, but there's no way for you to know, truly.