I can see the thought process as it probably happened: he thinks society is divided between the doers, the "working" class (the actually productive class would be more accurate) and the parasites (mostly the bureaucrats, paper pushers and all sorts of real or imaginary apparatchiks). Musk advertises himself as the ultimate producer, thus he's working class, and anyone who isn't making widgets at the widget factory are mere parasites sucking off the intellectual labor of the doers and makers. In other words, dude is a libertarian but he doesn't know it yet.