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Here's the deal: there are three types of Flat Earthers who regularly post to 4Chan: the rare prankster intellectuals who challenge your knowledge and debate skills (they will call your errors with some interestingly challenging responses), the occasional literal Bible interpreters (they sanctimoniously promote blind faith), and far and away the most proliferate: the juvenile-level troller (they routinely challenge you with insults, taunts, and exasperatingly flawed memes and statements).
None of them provide any evidence of phenomena that *require* a flat Earth model to explain, but rather place the onus on you to prove the round Earth (again, and again, ...) while belligerently disavowing or (and far more commonly) ignoring any science or proofs put forward. They will post memes that ostensibly 'prove' some flaw in the round Earth model, but containing geometry, maths, logic, and facts so absurdly wrong that you are compelled to display your superior intelligence and knowledge. By responding, you've stupidly taken the bait.
They don't care whether the Earth is flat or round. The game is all about the luls from getting you to spend time responding. They will provoke you with insults and the classic, "If you don't respond, you prove me right." If you reference web-based information (that they could have looked up, had they interest) they will accuse you of being a shill for a conspiracy. Either way, they will post even more silly nonsense to distract you from their previous blather and keep you on the defensive.
It is challenging to keep pace with their barrage of flaws, and the anonymous mask of 4Chan removes culpability irl and enables the prankster. Arguing is akin to painting over mud - you just end up with a dirty brush.