You can't.
That's because toddlers don't understand what an argument is and aren't interesting in having one.
Toddlers (which includes defensive bureaucrats, bullies, flat earthers, folks committed to a specific agenda and radio talk show hosts) may indicate that they'd like to have an argument, but they're actually engaging in connection, noise, play acting or a chance to earn status. It can be fun to be in opposition, to harangue or even to use power to change someone's position. ~ Seth Godin