"Tone policing" is a term made up by rude people in an attempt to excuse themselves for being rude. If someone in your group is yelling "fuck you" at another group, it's never going to help, and it's okay to point that out.

Someone likened the cult of positivity, to a trend in Silicon Valley employers that emerged over the past decade or so.

The trend of offering employees, unlimited & unrestricted vacation time.

Some people argued - and I fully agree with them - that while on paper the offered vacation time is unlimited, what it really meant in action was that your vacation time was unlimited,

* contingent on your readiness to accept any work load, shoved to your plate, equivalent or more in volume, that was displaced from the time you were gone.

* contingent on your willingness to accept blame for any "fires" that they had to put out in your absence, emerging from you not being there in your full working capacity.

and other stuff that went without saying and is implied in such matters.

So not even close to unlimited vacation in that sense.

This also meant employees feared taking anytime off because of all the implied risk.

Sometimes not even the amount of vacation they would take if they had clearly defined paid time off.

So it was a practice that was thoroughly hollow and false, even in intent.

Goes without saying, we need a lot less of this kind of faux positivity, masquerading in our lives.

I don’t get how that’s related to the OP’s comment.

The grand OP referred to concept of "cult of positivity."

  Policing tone is passive aggressive censorship & bias. 
  It's as hideous a concept as 'culture appropriation' or
  the cult of positivity.

It may have been voted down and dead at the time of your writing. Now its back alive.

The contrast between your argument and your tone is amusing.

Can't you call it microcensorship or something? Actual censorship is still very much a thing.

Censorship is a small subset of the techniques for shutting down discussion, and tone policing isn't in that subset at all. A diminutive doesn't help here.

Censorship doesn't always mean government censorship, or restriction of rights. Spam filters are censorship, for example.