Oh yeah I’ve met people like that. Of any age.

You can’t change them. There’s zero reason to debate with them. Pointless. You can’t change their mind. Now if he was a child, I’d suggest educating him. You can certainly educate an adult too, but he has to be willing to learn. If they aren’t willing to learn, it will be a waste of time. Engaging in these conversations with him is futile

If you must be around this person, “grey rock” them. If there’s no need to be around them, just avoid them.