I went down the flat earth rabbit hole recently because I was certain that these people were not serious, but quickly realized that they are deadly serious. Flat earth Dave is an ass and loves to say how totally stupid it is to believe we live on a globe. I wish I had the science to definitively refute him (he has an open offer of 2 BTC for anyone that can give undeniable proof of a globe) One of their favorite arguments is that “water always finds its level”
When doesn't water do that?
They argue that if we were on a globe water would have to “curve” - lol. They also say that airplanes would need to adjust for the speed of the earths rotation. It’s like they can’t understand a closed system. They think people on the other side of the earth would be upside down.. There IS NO up or down in space. I was sure it was a troll job at first but quickly realized just how serious they are.