Look, you did the right things, both times. Most people spend too much time putting up with BS or even rationalizing that it isn't BS they are putting up with

Look, you did the right things, both times. Most people spend too much time putting up with BS or even rationalizing that it isn't BS they are putting up with (a lot of people at Amazon are doing this right now.) Work on your temper if you want. But if you can be fired on the spot, you can quit on the spot. And you should. Every engineer should have their terms, and if the terms are violated, quit. If you join a company that is flex-- changing it to not flex is changing the terms of employement! Companies change your manager all the time, but how are you supposed to evaluate a company work environment if you can't count on the manager you interviewed being your manager when you get hired... but they think nothing of it because they think you're just a replaceable cog. Allow them some flexibility, but don't give into this idea that it's a foregone conclusion that you have no say in your work environment. Quitting on the spot sends a message. But that doesn't matter- they will rationalize. They aren't interested in learnign- and they won't learn from one person leaving.