I would agree with this, as my interactions largely share the same results.

It's not about being right so much as not being wrong. It's a position of arrogance and insolence that is being argued from, not really one of true educational purpose. It's dishonest discourse for the purpose of self-gratification, just like any other poster online looking just for kicks and giggles. There may be an honest belief behind flat-earthers and other such conspiracy theorists, but just observe the similarities between any bargain-bin message board troll and a flat-earth conspiracy theorist and it's easy to see the other motivations that drive the conspiracy theorists.

The big thing with conspiracy theories is that everything is evidence of the theory, whether it seems good or bad for the theory. You find indisputable proof that it's wrong, and the truth is twisted to be another conspiracy in and of itself which proves the legitimacy of the original theory. There is some inconclusive data that is the result of a long term study, and that is proof of the theory because the theory can be neatly fitted to the available evidence, barring any scrutiny.

It becomes a game of constant mental bouts, bringing in hoards of evidence against often unprepared targets, and truly the only real winning strategy is not to play. The entire point is to surprise and assault an unsuspecting person who is not prepared with the same amount of curated arguments and prepared answer cards.

If you've ever caught the sales side of a major organization, you'll know that they often produce "battle cards" for competing products. These battle cards are often built with three points; Attack, Defend, Avoid. Attack tells you how to best attack the competition and their weakest points that can be overcome. Defend tells you how to shore up your own product's weak points, and Avoid tells you want points to absolutely dodge at any cost and how to use the point as a pivot to something better (in order to ignore the difficult point). I see this 100% repeated in conspiracy theory image spam, and you can see the same thing with the message board trolls and how they prep for engaging people. The strategy isn't about arguments based on merit or reason, but instead creating a compelling narrative for an audience to follow.

And that's the real target here. Flat-earther conspiracy theorists and other such conspiracy theorists aren't looking to have a discourse and convince any specific person with an opposing view-point. They're looking to put on the greatest show possible to attract the largest audience, and maybe get a few converts along the way. You don't need to be hostile towards conspiracy theorists, but the idea of hearing them out and entertaining their thoughts beyond just a very limited and controlled dialogue is a bad idea, since the theory doesn't expand far beyond just having an alternative theory that bucks the current consensus. So sure, pay attention, and be polite, but also there's a need to be firm, because a lot of this is attention seeking behavior looking for a platform and for credulity, not for a discussion. The idea that they will dive deeper into more outrageous positions and theories is a bit silly, as they would do that anyways; as within any subculture, the desire to be "the most ____" will always drive participants to up the ante and act out in bigger and bigger ways. Whether or not one listens to them is irrelevant.