Yeah, that's another disheartening thing.
Every now and then you run across a hoax believer who seems well-spoken. They give the appearance of sufficient understanding of a subject to advance an argument. You engage in hopes of seeing that argument evolve.
Only to find they never move from their starting point. Eventually you run into their trail somewhere else, and realize that their practiced ease was, indeed, borne of practice. Of long rehearsal. It only looks smooth because they have rambled through it so many times some of the corners have worn off.