Not only are these kinds of people (flat earthers, climate change deniers, etc) fundamentally inept in terms of understanding Science, they're flat out dangerous. There are times and places for mockery and persecution and this most certainly is one.

Ideas like these need to be dismissed immediately upon their sharing and the people sharing them, in my opinion, need court-mandated remedial education. 
Or maybe we should just send them all up into space and get two birds with one first-hand experience of a stone.

Unless you're a scientist, you don't get to decide what is, and what is not fact.

Sometimes I honestly wish that Colorado would become like New Zealand. 

"You must be between 20 to 56 years old, have a good level of English, meet the health standards in New Zealand and possess skills needed on the local labor market."

In addition to, a Science, Technology, Engineering, and Math comprehension test for Colorado.

We don't need to build a wall. We need to just be selective.