In large organizations, the key to succeeding is to do great work. Or, at least, to appear so. That's why the culture might seem fake: everyone is doing super-amazing, everything is roses and sunshine!
This is due to the thermocline of truth effect, whereby people tend to report only on the positives and hush down on the negatives. Like warm water rises up and cold stays at the depths, upper management believes everything goes great while the people who do the work know better.
It is hard to resist this effect, as everyone has an incentive to appear successful to their peers and managers. Therefore, things inside an organization resemble a watermelon: green on the outside, red on the inside.
There are many more concepts in my "Mind Expander" tool (it's free)