Is the earth flat?

[Gandalf]

You jump up in the air and you come back down to the ground. What do you call that? You don't believe in gravity then?

I can't believe anybody actually engages with these people.

Diversity of thought is fun. You can put him on ignore if it upsets you so much. For instance, religion is silly, the modern Labour Party is silly, and Rap music is silly, but we seem to accept they have their place. I don't mind just as long as nobody is forcing me to change my own views.