Couldn't have said it better myself. Issue at hand is if you're working in an environment that enables such people and even encourages that behaviour. Suddenly, their voice is the same where it was never even a whisper before, and you can't do anything about it. It is extremely demotivating and I would actually propose a more radical approach to it - either embrace the shit in full and commit to it as well or really do engage into another company where there's a better filter for hiring. The latter are usually smaller companies because they can't afford no to.