You are right, I would have to go look it up. And, of course, I could go look it up. But it wouldn't change anything...
In other words. "I don't know what I'm talking about, and no I won't look up the facts, because facts won't change my mind."
I almost feel sorry for him. If he did some research, he'd realize how wrong he has been. And if he couldn't be miserable, what would he do for fun?