If objectively pointing out that one is playing badly is "belittling other players", you need a lesson on how to not take constructive criticism as a personal attack.
Especially in a thread where people don't play well, it shows up on logs but they blame the spec instead. I play badly from time to time like every other player, but my first reaction isn't to say "oh my goodness disc is 50-50 hybrid sucky other healers overtuned" - it is to see what I can do better myself.