That's an interesting speculation. I have about a third of regular commanders blocked. It honestly makes little difference if they're playing DRK, since I can support them perfectly well without the chat spam. (In fact I'm far more likely to miss a genuinely useful shout like a pinch warning because it's buried in a mess of condescension and 3-2-1 macros.) But the point is it's perfectly possible to lead a team without being condescending, and spamming chat to the point it becomes perilously close to griefing.
FWIW the silent commanders are a rarity, so I don't think people are being driven to that option because of push-back. It seems to me the chat spamming is a central part of the "performance" that some of these commanders like to stage. It amuses me how little impact these call-outs have on the outcome of the game. It's the DRK+ premade pulling the "ducklings" behind it that does the damage, not someone with a Napoleon complex in chat.