To your point -

If a friend texted me the same picture and question, I would do exactly what you described. Try to give a calculated guess that wouldn’t change.

Unless I was lazy and Googled it.

Google’s carbohydrate tool says 8g, then the AI overview goes on to contradict that by saying “A standard cheese sandwich typically contains between 25 and 35g.”

This poster has never made an LED blink and it shows.

Misguided, uneducated, oblivious, and downright stubborn are other options. Sunk-cost fallacy can keep people stuck in a loop.