I've been perversely interested in this Flat Earth movement for a few months. There are a lot of long, stunningly stupid, vehemently argued YouTube videos out there from flat earthers. There are a couple of basic science-minded people who take them on, often with some pretty entertaining results. But one thing is clear is that the flat earthers simply aren't listening. It goes a lot deeper than misunderstandings of facts or what they see when they walk outside. It's really hard to explain such weaponized ignorance. They aren't asking questions, they don't want to know, they just want to tear down the establishment (by exposing secret inside knowledge) in whatever way they can. It's psychological and goes much deeper than beliefs.