I flipped your first example because it doesn't relate to the situation we're talking about and what you were responding to.
B isn't trying to take something from A.
A is trying to woo (something near B) and B is promising consequences.
It no longer has anything to do about who is right, or what is right... that black and white right and wrong are no longer relevant.
If B is willing to back up the claims, A has to seriously consider their choices.
It's pretty close to the same in my example with the cousin... It doesn't matter if B is an asshole or is wrong, what does that have to do with anything?
The funny thing is, I don't think I'm even taking a position on the actual argument... I just think there's so much narrative control that many aren't even capable of considering alternative explanations.