I'm part of some flat earth debate groups because I like physics... they're real

Mostly it's a religious thing. These people you have to just ignore because you can take them to space and push them out into the void of space with no helmet so they could see the round spinning earth with their own eyes and the last thought that would go through their brain before they froze in the vacuum of space would be, "the devil has taken control of my vision"

I'd guess the 2nd most popular group of flat-earth supporters are just weird-o conspiracy people. The government lies about everything and since NASA is a government agency it too must be lying.

Then you got the people who are dumb and know they're dumb but after a lifetime of being called dumb have convinced themselves that they're actually the smartest person in the room and the only reason everyone thinks they're dumb is because everyone else is too dumb to understand their genius. These people think they know everything about physics but the shit they say just showcases their complete inability to understand even the most simple concepts

And then you just have people who just don't know any better. Like maybe it'll be a guy who's profile picture is him with some goats in a small village in Africa. He's well meaning but he knows nothing about relativity or gravity because he never really went to school and the education he did get was just from some other person in his village doing their best. You don't really need to understand relativity to survive in the deserts of Africa and so it's not well understood out there. This man walks 50 miles a day and has never seen a mountain in his entire life. All he's ever known is flat lands and dirt. Then one day he travels to a near-by village with electricity and gets on the internet only to see a bunch of crazy white people talking about how water sticks to a spinning dirt ball in space and he laughs. Silly city-people, they don't know shit.