What would you do if you sat next to a man on the bus and he turned to you and said “the moons made of cheese”. Would you say “how interesting”’and change seats? Or alternatively would you lecture the bloke on physics, geology, NASA and show him pictures of Neil Armstrong etc to the point of obsession until he concedeeds he was wrong? Great fun for everyone else on the bus though?
I’d nod politely and maybe move away from Rambo at the next stop.