The other day my wife was shaking her head yes and I was giving her a disgusted no face. Obviously, we disagreed.
Then we said to each other - wait are you thinking we should buy or we should sell? Maybe we agree?
It ended up that we did.
So before you move on, and start prepping all the ways to convince the other person how wrong they are, make sure you are both asking the same question. You might actually agree.