Essentially a failure to seriously allow for all the other realities out there that differ significantly from your own. The problem is aggravated when the protagonists become so fixated and post at such a rate, they don't allow the time for others to introduce more perspective to the discussion.

Individuals slowing down their post rate in a thread where they're becoming... overly engaged... will make a difference - it'll allow a broader perspective a chance to pop up and sink in.

Hence my appeal to slow down when you're getting caught up in the heat of the moment, which is certainly a lot easier to actually execute than another solution, being don't take criticism personally (which I entirely understand is not easy at times).
Very wide words, Dave.

The concept of trying not to get caught up in the rush of the moment is a very valid one.