That "friend" has less social skill than I do.
Even I know that whatever a relationship looks like on the outside is no reflection of what it is on the inside.

That bickering couple is playing out a conversation so cliche' that even our grandparents' grandparents could relate to it.

They're bickering over some perverse satisfaction they get from arguing with each-other, and for many couples, that's the backbone of their relationship. Frankly, the woman asking the question in the first place was basically, "You wanna bicker for a bit or no?" and when the husband answers yes, he's basically saying, "Yeah, I fancy a bit of an argument. The make-up is my favorite thing in the world."

If neither of them is awake enough to understand that, then you're right, there is no amount of logic that will ever compel them to understand that they are choosing this argument and it's something they're causing, not something that keeps randomly happening.