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If you read his comics [1], you'll see that he's quite self-aware of his own failings and realizes that he is often a jerk himself (sometimes unknowingly). I also got the sense from just this article that he was quite aware of the fact that he was being the asshole.

[1] http://www.thepaincomics.com/

The point may be that we are all that "guy" (or girl) at some point. How often to we all ignore someone else assuming the other person is the jerk?

This 'condition' is often exacerbated when you realize thinking is less "work" for you than it is the average person.

No, he explicitly describes the situation as finding himself on the "wrong" side of one of these conflicts. He understands that he was the bad guy that time.