I think to an extent people do this unconsciously, or offenders don't realize their projection onto others is bad faith. It's habit that is mistakenly believed

I think to an extent people do this unconsciously, or offenders don't realize their projection onto others is bad faith. It's habit that is mistakenly believed to be a good heuristic. I expect this triggers as they switch to "argument" mode following contradiction, assuming a posture of attacking/defending, casting nuance aside. As online spaces are concerned, one thing I liked about forums is that communities, while large, became increasingly familiar and you could reasonably expect some good faith discussion over time. On spaces like reddit, all the tip toeing in the world doesn't prevent it. You could be Mr Rogers speaking to someone's "elephant in the brain" and it wouldn't prevent it.