In some cases, you're attempting to unionize [1]. Some managers are less supportive of feedback than others. Depends on their experience and emotional intelligence. Management is not your friend, just as HR is for the company's benefit, not yours.

[1] https://www.wired.com/story/labor-board-backs-startup-engine...

> Despite their futuristic sheen, tech companies “actually operate like traditional industrialists and will go through old fashioned methods of suppressing workers,” he says.

That's the old argument "why do you need privacy if you're not doing anything wrong?"

The problem is there are grey lines everywhere and people are usually more judgemental of others than themselves even if they knowingly or unknowingly participate in the same behavior.