Toxic survival politics at a big tech company are a triple black diamond ski slope and if you are just learning to ski, you will get murdered by making a single mistake.
Knowing what I know now, human beings can behave in shockingly awful ways and politics can become extremely distorted in these environments.
The only way to survive a situation like this is to not react emotionally and to take an extremely neutral and objective approach. Do not become a threat or a problem, keep your opinions to yourself, carefully observe the Personalities and structure and understand who they are and why they are acting this way.
Do not engage in gossip or any negativity. Do not complain or criticize or raise questions.
You do not know the pressures, history or forces causing the behavior of your management and if you become the problem you are cooked.
I experienced a toxic situation myself recently, it caused me to do a lot of reading and research.
My peers who remained positive and optimistic and polite and non threatening or competitive survived the environment fine. They made a mental decision to be positive.
If you find yourself in this persons situation you had better keep your mouth shut until you can find a new place to go or you will get killed off by your peers and your management.