Need help — Principal investigator with abusive behavior
In my view you have three options: sit out, leave and stand up.
I share some thoughts about standing up. Your institution must have a behavioral integrity policy. You can talk to an ombudsperson or thrust person. You can do this anonymously. You are not the first and this is important information. Document the cases. Try to find and speak to your predecessors. What have they done in their situations and why? What was their outcome? What advise do you get from your ombudsperson or thrust person?
It takes a lot of courage to walk this route which in the end may lead to a formal complaint against this PI. There is no guarantee for success. Apparently this PI has been protected for a long time already on the expense of people with temporary contracts and lesser power. But it depends on history. You are not the first.
I cannot give you a single advice. If you can emotionally detach yourself, you can sit out your contract. But I understand you bring your own money. I fear he will not let you go easily anyhow. You are valuable to this PI bringing in research results and publications. You are feeding your PI.
If you can’t emotionally detach yourself, you should leave or stand up.
When leaving, do not be afraid that this PI may harm your reputation in science. Science is a huge place and your PI will have a reputation too. Trust me, PI’s loosing postdocs, PhD’s and students, not delivering results (publications and grants) are not taken that seriously. Especially when you can show your results.