Self-appointed. And these self-appointed homunculi will destroy anyone who does not adhere to their orthodoxy (see John Rocker or their current attempts to hang someone for under-inflated footballs).
The “problem” with Belichick is that he tell the coaches association to stuff it, he is brilliant, he gets coaching and he is running circles around the rest. So the jealous and pathetic want to tear him down. Ridiculous.