In my friend's opinion, Flat Earthers are crackpot pseudo-scientists. The Flat-Earthers, in my e-mail exchanges with them, reject those labels, and will cite a respected study endorsing their opinion: from 1650. Respected by discredited persons.
Heresy! I'm a proud member of the Flat Earth Society. Apparently, someone forgot to tell all the people who've joined lately that the whole thing is supposed to be sarcasm aimed at other pseudo-sciences...