There's a trend of people diagnosing themselves with medical conditions that explain away their shortcomings. In this case, the author wrote a long rant about how he believes other people are causing themselves harm through their choices of actions, but throws in an exemption for himself at the very end.

He believes he's different, as his condition is the result of genetics or something, which means he does not deserve any blame for his situation, unlike everyone else.

Self-righteousness.