When you’re young, and especially if you come from a lower income background (where authority is treated as an absolute, and abuse of authority is generally more common and accepted), it can seem very risky and feel very unacceptable to give this kind of feedback to your manager.
It’s easy for me to agree with you now, but there are very different feelings about this across different backgrounds and cultures, and there are plenty of managers who would react harshly to this.
There's a huge chance that, if you are actually working in a toxic environment, complaining about it will result in blowback directly targeted at you.
As a manager, it's on ME to setup the environment for candid feedback. It's something I have to emphasize over and over again and demonstrate very clearly and publicly to everyone that it's ok and it's what I expect.
If the boss isn't creating that environment, then it's a risky, uphill battle for any subordinate to create change. Not impossible, but it's difficult to recommend it.
I know it's hard and it took me until my 30s with a long career behind me but I really wish people would be more vocal about their issues to their managers, even if it's about their management style or them burning people out, etc. There is a huge chance that you're not the only one with those feelings and there might be people newer to the team or career that are afraid of speaking up for things that they really truly disagree with, or just the people who get anxious with confrontation.