They have to shit on someone, Cvalda. I've had jobs where I felt just like that, like the better job I do, the more at-risk I am of being fired.
Most businesses are like that. It's rare these days that doing a good job will have any relevance on your ability to keep said job, nonetheless advance. It's all kind of a backwards, shitty mess, imo, and creates this insane environment of constant self-doubt and endless sacrifices for a company you aren't even sure will keep you on the payroll. I used to do it a lot when I was young, then you figure out that people will take your best efforts with them as they shit on you and kick you to the curb. Kind of cannibalistic or predatory behavior. Sad and abusive, but what choice do people have?
Bend over and take it, or don't have a job unless daddy owns the company. Doesn't forced nepotism lead to a sort of family-profession medieval type deal?
f**k all that noise. Sorry to hear it.