For the first time in my life I met and engaged with a flat earther, here on this website. I was accused of not having an open mind. When I told her that I spent a good portion of my career in satellite operations and space launch, I never heard from her again. I'm of two minds on the whole notion of engaging the fringe. I mean, if the batshit is that deep, do you really want to wade into it? In any case, if the world were flat, I'd sure enjoy living on the edge!

The earth is a spinning ball can easily be demonstrated with the Coriolis Effect. Have him take a 5 gallon bucket fill it half way with water with a hole in the centre and watch the water make circular movement. Then find him a flattard in the souther hemisphere to repeat the experiment and compare notes. . .

The first discussion I had with a flattard I gave him these links

This is my latest 'meaningful' conversation with a 'Flatearth' cultist.
Flattard ( Hot Anal) :- "Prove to me it's a spinning ball"
Me (Skyfacer) :-
"Now there you go Hot Anal. Ranting on demanding proof of this and that. You're the one making an incredible claim. The fact that the Earth is a global / spherical planet like all the other planets is common knowledge , or what is known as an axiomatic fact.
He who makes incredible claims needs to have incredible proof/s of the reality of that claim. You have no such proof because you are peddling fantasy ideas. In other words the onus of proof lies with YOU.
But I guess you're enjoying living in your fantasy 'dream cuckoo' world. I can understand that. These beliefs make you feel good and give you the 'satisfaction' that you're the custodian of 'special knowledge'. Go for it. Whatever 'rocks your boat' I guess".
No answer back at yet. I await with great ancipitation.