Flat Earth is a scam
It uses cult tactics to target poorly educated and socially dysfunctional people who are easily misled by making them beleive they are special.
Aircraft flight plans prove the Earth is a Globe. The Equatorial Mount proves the Earth is a Globe.
This channel is dedicated to showing how easy it is for anyone to confirm the Earth is not flat.
Every flat Earther you encounter will have difficulty with simple Math, Geometry, physics and scale.
The best way to defeat any Flat Earther is to ask for a flat Earth map that works. They don't have one.
Ask them for a flight plan based on a Flat Earth. They can't do it. Don't accept excuses.
They will try to side step and lead you to irrelevant arguments when they are cornered. Don't fall for it. Keep asking the same question because when they are cornered they will run.