One of the tactics of communists is to destabilize a country by ripping out all the foundations of the society. History, morality, traditions all must be marginialized and eliminated as much as possible.
Here comes flat earth, to contribute to that. They love to come up with scientific-sounding explanations why the earth is a flat disk, and ignore basic physics. They toss around a lot of complex sounding explanations while ignoring observable facts and invent their own science. It's all done in an effort to destabilize the country, just like all the sexual madness that's being pushed.
Go to the ocean, stand on the shoreline with an island several miles away in the distance. Set up light pointed at the island, take a boat 10+ miles to island, observe light from the shoreline while standing on the beach. Globe earth, or at a minimum globe earth at the size that is claimed, debunked. That's using the equations that are presented as fact for how far you should be able to see. It's been done 100s of times on YouTube.
You need to be forcibly remanded to a mental institution.