My own experience with Flat-Earth Society members is several decades ago and turned me off them completely.
They seem to me to be a bunch of smart-alecs who take childish glee in talking slightly dimmer people into accepting their rhetoric.
They have all the appearance, to dullish folks, of being intelligent, but they're really just carnies.
I've never met a Flat-Earth Society member who is an actual hard scientist, but I bet there are people who'd love to prove me wrong.
They remind me mostly of smart-arsed Christian preacher types, who learn a spiel and then love applying it for the sheer joy of flummoxing other people.
I've seen it in action, and it makes me want to go rinse my mouth out with something.