Meanwhile, look at the things that aren’t tone-policed:
Complaints about “tone” are always an attempt to silence the right. That’s true regardless of whether the people complaining about “tone” are Democrats or Republicans.
People on the Left can and do say the most extraordinarily incendiary, racist, and divisive things, and they never get called out for their ‘tone” by people like Romney or the other members of the GOP establishment. Because at the end of the day, Romney and the GOPe are ideologically aligned with the Left.