To get and hold onto a new job, it's imperative to understand every aspect of the organizational culture. The only exception to that is if you are a genius the company really needs at the time. Then you can ignore the mores.
The most reliable guide to what the culture's values are is what is gossiped about. In his book "Gossip," Joseph Epstein points that out. It's in that gossip that the alert can pick up what the rules really are. If the gossips are hammering the executive who chewed out an employee in public, then it's clear that civility is part of the code of behavior.
On the other hand, what isn't gossiped about also reveals plenty. The Wall Street Journal announces that the company leaders gave themselves 7% to 23% raises. No one is talking about it. That's because one value is to grab as much as you can while you can. The expectation is a short shelf life for most in the company. So, you recognize you too are going to take the money and run.
Of course, values, like everything else, change. It's a matter of survival to retain access to the grapevine. That's where you find out how the rules are changing.