Flat Earthers are funny. Not ha ha funny but 🤦🏻♀️ funny.
The notion of a flat earth hasn't been tenable for 2500 years, for rather simple, non-mathematical reasons.
If the sun that comes up is the same one that comes down, then the Earth must be limited in size. If it is not to be more than a few tens of miles in size, as exploration demonstrates, then the shape cannot be flat. The fact that one can see farther from a mountaintop than on a plain shows that the surface of the earth must fall away from where one is standing.
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And if the surface falls away consistently in all directions, then the most probable shape is a large spheroid. Other shapes are possible, but none of them is flat.
You don't even need to go into outer space to figure that.
@DavidSalo when I first heard of them I thought it was total satire. NOBODY could be that ridiculous. But apparently there are a good number of them. 🤦🏻♀️🤦🏻♀️🤦🏻♀️