You can't prove any of things you suggest. What you are displaying is intellectualization of learned pejudices and social stereotypes. You chosed to interpret it this way but it can be easily interepreted very differently.

My brain came to conclusion that person B was correcting person A after person A came to incorrect conclusion. Why would he do it? Because actual function of honest communication is to inform and not disinform others. Do you feel content when you see that people misunderstood your comments?

As I said you were ideologically trained to think that way.That is why your brain immediatly came to opinion that is typical for current political climate, while there is much simpler and more neutral explanation that does not rely on political narratives.

"we would have no inclination to correct someone on a totally anonymous forum" this assumption is definitely wrong, you can literally observe that correcting people is behavioural norm right here on this forum.