Flat Earth was designed to make Conspiracy Theorists look like idiots, but too many of them started brushing it off too quickly. They learned their lesson. Birds Aren't Real was designed for the same purpose, but was deliberately made to be ridiculous.
Add to or poke holes in this theory.
A gyroscope proves the Earth isn't spinning, and a water level tool proves all surface water on Earth is level, which rules out it being a ball or a globe.