I mean, I can always decide to argue with someone who seems to disagree but is willing to stick to the rules as argue in good faith. Who knows, maybe one or both of us can learn something. Likewise, I can always decide that someone is so far gone that there's no point. But to categorically avoid any argument that sounds stupid is not helpful.

Those people are like that because a) they are genuinely bad people, b) they are fueling the fire on purpose, and c) nobody ever convinced them they are stupid.

To not let the a) and b) win, yes, we need to convince people that what they heard is wrong.