Okay, so let's parse the...the...”logic” of Ben-Dover's argument:
A lot of people respond to flat-earth dumbfuckery by calling it for what it is.
This OP sees the common (and rational) reaction as being just a little too universal.
If it's not coincidence that so many people react to the same thing in the same way, then it must be CONSPIRACY (!!!) - a conspiracy to silence FE jackasses through mockery (never mind that no one is censoring them).
With most people deriding them, (1) proponents of a flat earth must surely be considered the underdogs, and (2) underdogs are good guys, and (3) good guys never lie. They claim the Earth is flat, and so it surely must be.
It's never occurred to Ben, the scholar, that people have tried rationality on proponents of a flat Earth, and failed (pretty much entirely because FE is not some rogue scientific position but rather it is built entirely out of a religious dogma that relies on anti-intellectualism, and promotes it, in service to agendas that are anything but good).
Unlike a lot of other matters related to either science or religion, this is a wholly and completely settled issue: The Earth is pretty much round. Zero doubt. Complete consensus in the scientific community. Average people can make the same observations, without the need for high-tech equipment, and come to the same conclusions as did ancient astronomers and mariners.
ETA: Why do ships disappear over the horizon bottom-first?
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YouTuber Vsauce explains how gravity would function on a flat world (assuming, of course, that the world weren't crushed into a spheroid by that gravity). Does our gravity function that way? No.
When we look at other planets in our solar system, what shape are they and why?
That the Earth is round is a brute fact with enough evidence across all the natural world that anyone who cares to take note will recognise it.