The difference is that children want to learn, or at least society is built to typecast them into the roll of students - it’s the opposite for adults; if you try to teach a kid something, they’ll usually at least listen to you, even if they might not internalize what you told them, but if you do the same to a fellow adult, more often than not they’ll get offended and dig even harder into their incorrect ideals. I’ve met very few adults who where honestly willing to change their opinion based on a conversation with someone who’s not specifically in a leadership-style role like a boss, professor, pastor, etc.