I have a friend who went to prison, was there for several years, and came out a flat-earther. He’s all the time posting about it on Facebook. He knows I’m a lifelong astronomy nut (with an interest in science in general), he hasn’t tried convincing me personally. I just leave him alone, and pray that he’ll be convinced about the sphere we live upon. Maybe someday he’ll come to his senses. In the meantime I’m just mystified that anyone could be a flat earther in this day and age.
Oh, nonsense!
Earth isn't a sphere!
It's an oblate spheroid ... ;'}