https://youtu.be/4Qpzl8bWMnIWhile not appearing to be a strict flatty in a literal sense, analysis of this guy can offer insight into the dynamic in which a flat earther conceptualizes and formulates their worldview and argues their case.
Note, he is at no point making an argument. His points have the appearance of arguments, but all he is arguing is his personal disbelief, based on a lack of comprehension of what he is seeing. This is the trap flat earthers beckon reasonable skeptics into, and why 'debates' and discussions with flat earthers never go anywhere.
Its not about arguing facts and evidence, because if facts and evidence were comprehended there'd be no argument.
Flat earthers insist on arguing their
diabelief, which is as subjective as what one thinks 'the best flavor of ice cream is'. Additionally, flatties positions (from their perspective) is actually insulated by a lack of comprehension.
Now, a skeptical person wouldnt conclude either a flat or a round earth, they would keep asking questions to determine which viewpoints, data sets, figures, and values are corroborrated by other experiments and data sets. Eventually, those values will coalesce into an aggregated spectrum of concurrence and consistency.
Flat earthers however have already jumped the shark and have wilfully vested their interest in proving/promoting flat earth rather than asking the questions that would lead them to a viable and predictive model that can withstand scrutiny.
In short, being a flat earther is about promoting a 'flat earth' - as in, an ideologue - rather than pursuing a framework that explains all the observable phenomena, while accounting for a flat earth.
You cant educate a person on how ignorant they are of the existing science when their worldview depends on that ignorance, and they will resent you for trying. Protip: thats what the Psalm(?) about pearls before wolves/dogs is about.