Flat earthers don't tend to worry about theories, they prefer to focus on the scientific method, stuff that can be observed, measured and repeated. Water always finds it's level, horizon is always flat at any height, no curvature, a pressurized system (the atmosphere) must have some sort of containment and couldn't be beside a claimed vacuum with no separation etc.
Also a lot of the physics of a spinning earth doesn't make sense. Satellites and the space rockets for example, defy the 2nd law of thermal dynamics.
Flat earthers seem like the only skeptical thinkers these days.
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