Can I come along and note that I was in that thread supporting that guy? Because that would be valuable for my self-esteem.

This is because many people don't care and/or switch to autopilot and double-down on their wrong point instead of being able to switch to a position where they can rationalize alternative answers and admit they are wrong. It is quite frustrating to deal with these people[0].

[0] https://youarenotsosmart.com/2011/06/10/the-backfire-effect/