If you have a manager (or another colleague) who is bullying you repeatedly or who acts very unprofessionally to you over and over again, you HAVE to take steps to bring it to an end.
No one deserves to have this type of stress in their life. I’ve seen (and experienced) how this behavior can negatively impact people’s health.
The first thing you have to do is clearly document the behavior.
Second, practice what you are going to say to whomever is bullying or mistreating you at work in a calm but firm tone.
And third, sit down in a private 1:1 meeting, lay out the issue(s), and TELL them their mistreatment of you stops right now.
Often, this is all that will be necessary because bullies, underneath all the false bravado, are just cowards who likely know what they are doing is wrong, but just keep doing it because they feel they can get away with it with you.
This is not your fault, but you must take steps to stop it.
If that doesn’t work, you escalate accordingly. Either through HR or, if that’s not enough, an appropriate employment lawyer.
Bottom line: No one deserves to be bullied or mistreated in the workplace and the only one who can REALLY make sure it comes to an end is you.