When DH served in the military they had a saying - "F*** up, move up.". Meaning they promoted people who didn't do their job well to get rid of them, while those who were good at their job stayed behind as workhorses and didn't get promoted as often.

There's an ad on TV right now where the boss comes in and all but one worker hides, then she assured him she's "on it.". That commercial bugs me. It's way too true.

I'm sorry you are dealing with this sort of thing. It really isn't right or fair . But way too common.