But they're not talking about something you cannot "verify" with your own mind right now, at worst with some additional reading. You're not asked to "trust" anyone.

"That person freaked out just because someone said the Earth is flat, so that their brain completely glazed over and they couldn't understand or care about anything else they said", why is that not a thing, too?

To me this kind of discussion is not intellectually honest, it's not an earnest attempt -- there's plenty brilliant people of faith so I see no reason to dismiss anything out of hand like that. Don't judge a book by its cover, yet this discussion about the cover is the one that the most energy is spent on.