Let's take OP's favorite ideologue - Eric Dubay - to further illustrate this phenomenon. It's only 5.5min (unless you tire of his droning, monotinous, 'totally not neuro-linguistic programming, why would you suggest that?' oration and speed it up).
https://www.bitchute.com/video/mkrgeqFDQVpq/As (you) watch this video, you'll want to set aside your critical capacity; the point is not to determine the (in)validity of his premise, instead the intent should be to experience the awe/impression that this video has on flat earthers (keep the brain-bleach close tho). His conviction, the simplicity of his ideas, it's impressive, right? He must be right, it's so simple, isnt it?
A true flatty will experience all of these phenomena, except that some element of the formula eliminates the possibility that legitimate refutation can be viewed as valid. The authoritarianism is sufficient that the POSSIBILITY of refutation has been (to the flatty) PROVEN to not exist.
I have addressed why this video (and OP) is lunacy from my basic recollection of astronomy, aided by citations from google. Its that simple. But my refutations - and the following more comprehensive ones - have (again, to the flatty) are defacto invalid, because they refute "what is true", a 'flat earth'.
https://www.bitchute.com/video/mkrgeqFDQVpq/And of course, he comes pre-loaded with observably false and/or spurious excuses why the facts issued are irrelevant/invalid; shill, NASA, Freemason, etc.
Whether individuals are any of the above or not doesnt diminish the content of their argument, alluding to the extreme predisposition/conviction I refer to. Also, dont ask OP to cite any of these NASA/Mason shills, as once again his belief is sufficient to dismiss both the person entirely and anything they might say (unless they happen to say something that could loosely be interpreted as relating to a flat earth, in which case it will be proclaimed as "NASA/mason shill slips and proves flat earth").