They literally don't know what's going on in the locker room, what's going on on the sideline, what adjustments the D is making in real time against the specific set and personnel, etc etc

So when people are on CB during the game it gets funny and weird when we have a few bad series and suddenly people are talking about how they know more than the coaches. ]

They just don't—that's all there is to it, and it's fun to make fun of those people.