In Winning an Argument, Shane Parrish writes:
If you want to win an argument, ask the person trying to convince you of something to explain how it would work. Odds are they have not done the work required to hold an opinion. If they can explain why they are correct and how things would work, you’ll learn something. If they can’t you’ll soften their views, perhaps nudging them ever so softly toward your views.
It is worth bearing in mind, however, that someone might do the same to you.