Ultimately, it's normal to believe what people tell you when there's no obvious reason for doubt. If my coworker says they're late because they got stuck behind an accident, I'm not gonna demand photos and a police report. So to people who haven't acquired a high degree Internet literacy, saying "don't believe what you read" sounds like some kind of trick.

I remember a passionate argument I had about some unsourced story of poor Stripe customer support. The other guy was genuinely baffled why I would question the poor merchant who was being so cruelly mistreated.