I have some big respect for flat earthers. It takes a lot to challenge such an intrinsic belief. I don't think it's true. I've literally flown around the world. But I'm not going to call them retards when so many of our fundamental western beliefs (in government, modern medicine, etc.) are obvious lies.

I think the Earth is a sphere, but if someone is going to start down the flat earth rabbit hole, why stop there? Simulation theory is also a religious belief, and is much easier to reason around.