This is like thinking that you're gonna tail gate someone who is driving slow and teach them a lesson.

You wanna be right or you wanna be happy? You only wanna be right if you may lose something that will make it harder for your family to be happy and talking to this idiot is only gonna annoy you or your family. Prolly never gonna meet this child again in my life, not on me to teach random people lessons that their parents should have, and I would argue that if a control family that was exactly like mine in every way except for one, they got bogged down trying to take a stand against every person they met who crazy, would just end up doing worse. Most of these lessons you dish out prolly dont take either.

You should only 'always take a stand' if it really makes you happy because the only other pro is that you most likey won't, but could, change a crazy person's mind on an issue