Why are some of these buffs so confident in their terribly incorrect information?

There's always been buffs, we all know that. Recently, I've noticed an uptick in buffs, who have never fought a fire in their lives, trying to explain to people in their comment section about how departments work, why an operation was carried out in a certain way, etc.

Then somebody comments "I'm a firefighter at [department the post was made about] and all of that is incorrect," and then these camera crusaders have the balls to argue with actual firefighters about how their departments work and how fires should be fought. It blows my mind every time. Has anyone else seen this?