Usually such bickering means that people asking this want FD to change their answer.
I don't necessarily want FD to change their answer, as I may have missed some aspect to the argument which would alter my view.
I do want them to at least show they acknowledge the various sides of the argument, and to explain their position *in that context*.
Unless they do that, my view is that they don't have a good explanation for their position, and they are just being pig-headed having decided on it a long time ago,
maybe they didn't foresee some of the issues and viewpoints that would arise with CG and PP, they find themselves between a rock and a hard place and would rather just dismiss it as per the OP.