The best argument sometimes is just one question they can’t answer.

Counterarguments give the other person something to push against, and pushing back is easy and satisfying. A genuine question offers none of that. It makes them examine their own position, and if there is a hole in it they find it themselves, which is the only way anybody ever really changes their mind. Your job is to ask and then be quiet.

Instead of the rebuttal you had ready, ask what would have to be true for their view to hold. Ask it without sarcasm, because sarcasm turns it back into an attack. Then wait, and let the silence do the rest.