Thank you, I agree. If I may, I would like to say the same thing over again, in my own words, to demonstrate a difference in the way I think. *grin*
Person X, person Y... We can agree that the world is most probably round, so from the perspective of our shared reality X's take on reality is a mis-take. But X doesn't know otherwise, because he doesn't share our shared reality. He has a flat-earth perspective; he lives in a flat-earth world. While he truly believes in something that from our perspective is incorrect (an assumption based on our shared reality), it is not incorrect from his perspective. He may adopt a new view if he gets new information, but in the context that he understood the flat-earth world he will always understand the flat-earth world. If he adopts the new view, he can, and probably will, live in two worlds, both true in their contexts.