I know a flat earther and he claims that you’re looking at a fake view when you’re on an aircraft and that it’s a hologram. He likes to throw sci-fi words around even though he has no idea what they mean.

Conspiracy theorists don’t actually know what they’re talking about so they will always come up with some excuse as to justify why they are still right and you are still wrong. Trying to prove otherwise is a waste of your time talking to them is a waste of your time.

If the earth really was flat someone would have worked out a way to commercialize the edge. It has to be useful for something right, waste disposal springs to mind, in any case it would be far more profitable to just publicly announced that the world is flat than to construct this elaborate conspiracy for no obvious reason.