So, your professional musician theory probably is more likely. That said, I've dealt with many of them, too, with no problem. So maybe he was just uniquely M? 😳
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Well, I believe he wasn't a very successful musician, as far as I know, always playing temp jobs on the fly. And I think he was doing equipment or studio jobs at the time of his posting here,
in 'Merica, of all places!. So maybe there was a little bit of unhappiness there.
I'm also fairly sure these music groups attract a fairly reliable number of cranks and not entirely well-adapted members of society, frankly I'm ready to count myself in either of those groups (but not both at the same time, please!), who need to act out a form of superiority here they're lacking IRL.