I used to treat them under the assumption that they were honest, really believed what they were saying, and genuinely thought they had a good argument. That was a mistake. None of those hold true. For example, the incessant repeating of “how do you know that?” is obvious nonsense. If someone actually failed to see that and was using it in earnest, using the line back at him would enable him to see it. But, as it is inherently dishonest, such users have a meaningless stock phrase that they can use as an answer. They say “because [deception] has revealed it in such a way that we can be certain.” They are, of course, completely non-specific on the nature of this “revelation,” because it is entirely fictitious. They have no revelation. It’s all just one big lie.
Another clue that they are lying is that they will ask you to “account” for reasoning. Such a request is not reasonable as one must use reasoning to account for anything. Reasoning must simply be assumed as a premise. But the deceivers are quite aware that they can cause great frustration in anyone who takes them as genuine.