I honestly think a lot of the flat earther types in particular are basically trolls and/or enjoy being stubborn/argue about common knowledge, for no other reason because they can.
I think it used to be like that but then a lot of people were actually convinced, or people who already actually believed it were attracted to the parody argument.
The flat earther I knew was sincere. He had fallen down a YouTube rabbit hole after decades of religious indoctrination had dulled his critical thinking skills.
Another religious friend became a 9/11 truther and Elon-stan (post cave diver).
For a time, I honestly believed the Earth may be only 6K years old because of the magic sky being and similar indoctrination.
I honestly think a lot of the flat earther types in particular are basically trolls and/or enjoy being stubborn/argue about common knowledge, for no other reason because they can.