So, Doodski, let me be sure I have this straight. You have a friend that annoys you with his version of the audio nut topic. When confronted, he uses the "well, I am somewhat bipolar" excuse without offering his "Bipolar Diploma" issued by his Psychiatrist. This preys on your mind to the point you decide to present the problem to 500 or more assholes at ASR. For reference of a similar phenomenon, check out this link.
Well, since you opened a Pandoras Box of sorts by posting this on the forum, I am making the assumption you want to hear from all points of view - not just those supporting your own personal viewpoint.
Have you considered the possibility that your own anal retentive OCD audio point of view may be creating the "friction" in this case? I am asking this both in "jest and seriously". The answer of "who is at fault" is not really part of the solution. You can remain friends, no longer be friends, or limit contact to keep the "powder keg" from blowing up. Your friend may be feeling similar frustrations and may experience "relief" as well if just one of you would make a choice going forward.
By the way, this advice worth exactly what you paid - nothing.