It's like Popper's paradox of tolerance. Defending the very principle of being respectful sometimes requires to disrespect the disrespectful.You call their balance healthy because you like it. Of course, things seem more harmonious when dissent is silenced. Yeah mugstennisforums is quite rude, well rudeness exists, better to have it expressed than let it stew internally. Negativity won't disappear because you ban it, only from public view. Thankfully, other tennis communities exist as alternatives so you're in no way confined to wrestling with harsh attitudes.
Too much attention paid to form rather than content. It'd be nicer if people expressed themselves more gently, but anything other than thoughtful match analysis is fluff anyway, that adds nothing to the actual discussion. Folks come here for emotions mostly. Also sweet of you, of course, to omit that the very point you're making is disrespectful of certain people and attitudes, even as you deem them worthy of disrespect.