seems you may have a misunderstanding of what boundaries are..
They are self governing rules for one's inner peace and protection.
They are not threats to make another do what we want...or else.
A boundary is a self determined choice I make to keep myself from harm. When I make a boundary, I place it upon myself not others.
Example:
I choose to not be in the presence in person or via phone with a person under the influence of alcohol.
Now, that doesnt mean the person who drinks must be sober around me. I may ask them to respect my new self imposed rule, however, I will not expect them to respect that. That rarely do. So, that means if they choose not to respect me, and come into my presence drunk, I leave.
I am the one with the boudnary, I am the one required to enforce it.
Boundaries dont make people shape up, they make ME shape up to perserve the self respect I have developed.