What else doesn't exist? Australia. That's right, readers from Australia -- or should we say, paid actors -- your country is simply a clever cover-up for a mass criminal genocide in Victorian Britain. And all those sheeple who think they spent their year after college there, they've been duped. Pilots just fly around in circles for a couple of hours and then take you to South America, landing on a set with actors pretending it's a fictional Oceania continent. Or as we like to call it, doing a reverse Peter Jackson.
In fact, current flat earthers are so set on disproving their entire reality that they even turn on their own traditional theories. Gone are the old, silly days of believing such nonsense like the Earth resting on the back of a giant turtle. The new "plausible" model is that our diamond-shaped world is simply firmly affixed to a set of pillars. Space pillars. Much more sensible.
The pillars themselves are still on turtles, obviously.
Even the old fear of being able to fall off this flat Earth of ours have now been roundly debunked through a simple yet revolutionary bit of nonsense called the "Pac-Man effect." See, you can't fall off the edges of the Earth because spacetime instead warps you back to the other side, like Pac-Man hitting an open end of the maze. And if they think Pac-Man proves anything, their minds are going blown when they discover parallax scrolling in a couple of years.