Conversation implies two people participating equally, I don't think he ever had good conversations. He had some interesting guests on, but he was in no way an equal or even significant contributor to said appearances.

Also I questioned the believe everything he's told thing. I've seen clips of people explaining why he's wrong on things and his Meathead not been able to grasp it and sticking with it. Even clips of his producer explaining why one of the things he says is completely wrong and made up, and he still believes it. My favorite clip of him is him screaming at a scientist who spinner entire career studying chimpanzees I think it was. He didn't believe what she said. So I'm not so sure about the believes whatever he is told thing.