Who believes the Earth is flat? As far as I'm aware, nobody does and nobody ever did. The belief in flat earthers is ironically stronger and more like a conspiracy theory than the belief in a flat Earth.
Is the rapper B.O.B. trolling with his GoFundMe Campaign to build a satellite and find the truth?
Maybe they are media savvy ploys to generate free attention, but they have thousands of fans that aren't in on the joke.
I used to think exactly what you do, but that is the definition of liberal bias. I couldn't imagine a world where someone would be so stupid enough to think the world was flat.
I also couldn't imagine a world where people were stupid enough to elect Donald Trump. But the divide in this country is real, and beliefs like ours are making it worse. Some people's scientific literacy really is limited to what they can see in front of them.
Apparently this "movement" is really small though and shut down entirely for long periods throughout history. The most recent resurrection being only a few years ago and the Flat Earth Society claims its membership grows by a couple hundred people a year. Well, there are millions of people who believe in Noah's flood despite there being no evidence it ever happened and lots that it didn't, so I can well believe a few hundred people believe in a flat earth. The world is a big place.
I don't think you can compare flat earthers to Trump voters though. Lots of people voted for Trump because they have different priorities to you (e.g. hating political correctness, hating Clinton, really wanting immigration controls), not because they disagree on basic laws of physics.
For the record, I was thinking of this:
https://en.wikipedia.org/wiki/Myth_of_the_flat_Earth
... the false belief that the belief in a flat Earth was common in the past.