Fair to speculate that the other person was the problem. They didn't say it was a certain thing. Some people have blind spots that prevent them from realizing that their actions may not fly with the other person. I can't speak to how objective this poster's self-evaluation was, but I guess they felt they were better able to predict the reactions of the other person, and accordingly, were better able to avoid doing things to irritate others.

To be fair, I do see how you could misinterpret this as blaming the other person; but an alternate take is that the person is brainstorming, after reading the article, that the other person was simply less adept at predicting behavior.