Point #2: Say nothing behind another's back you'd be unwilling to say,
in exactly the same tone and language, to his face.
This has essentially been shut down in the modern corporate workplace, at least in the Anglosphere. The overpolite "be nice, be respectful" culture punishes anything that can be construed as "not nice", forcing it to go unsaid or at least pushing it underground. We talk in code and euphemisms about these things. You are justified in avoiding any kind of negativity entirely to protect your income. The net result is everybody loses a little.
This has essentially been shut down in the modern corporate workplace, at least in the Anglosphere. The overpolite "be nice, be respectful" culture punishes anything that can be construed as "not nice", forcing it to go unsaid or at least pushing it underground. We talk in code and euphemisms about these things. You are justified in avoiding any kind of negativity entirely to protect your income. The net result is everybody loses a little.