Boundaries Are Not Punishments
People get boundaries twisted. They think a boundary is "you can't talk to me like that." That's a request, and they might ignore it.
A boundary is "if you talk to me like that, I'm going to leave the conversation." That part is fully in your control.
This shift matters because it takes the pressure off. You're not waiting for anyone to change. You're deciding how you'll respond if they don't.
Boundaries also aren't revenge. You're not setting one to teach someone a lesson. You're setting one so you can keep showing up in a relationship without losing yourself in it.
Will some people be upset? Yes. Usually the ones who benefited most from you having none.
Say it calmly. Follow through consistently. Let their reaction be their business.