After reading this, I realized that I'd been conflating how easily I believe random information people tell me that I don't have much of anything invested in and don't expect them to have reason to lie about (which would probably not take much skill, since it often happens by accident when people are trying to make a joke), and things I'm actually trying to evaluate. I do have a sense of when someone is trying too hard to sound impressive, so then being able to pull it off would indicate skill. I see what you mean now.