I should also clarify that I'm not saying snopes is the end-all fact-checker. I would have been curious and explored any alternative, "non-liberal" fact-checker.

My point is that this individual has written off all fact-checking as an entire discipline. They are the final arbiter of truth. That fundamentally prohibits discussion of almost anything, or at least makes it extraordinarily labor intensive.

One might counter-argue, well, start with their beliefs and work outwards to illustrate contradictions and such. Very Kantian. Except that is 1) very labor intensive, and 2) doesn't cover all issues.