Why do you believe that? Have you been in a bunch of pitch perfect productive conversations about racism? In my experience, when one tactic for derailing conversations about racism fails people just pick up another one. In this conversation you see many such strategies at play:

I see all of these as efforts to not talk about the actual structures being criticized in the post:

* Saying the tone makes the message unlistenable * Talking about the extent to which the post is effective activism ("he would be more effective if...") * Stopping conversation do to perceived insurmountable "bias" * Refocusing on other forms of racism (like the dumbwhite* comments) * Talking about whether people are "racists" and refocusing on their overall character.

It goes on and on. Pitch perfect tone doesn't get you through that wilderness.

And honestly, when someone has been through something so traumatic, demanding perfect pitch is heartless.