I absolutely cannot stand the word "boundaries" when talking about anything other than a fence. I hate it to the point that I cancelled therapy sessions with a social worker who refused to stop using the word, even though I asked her nicely not to several times. The reason I hate it is because it is often unnecessary psychobabble that has no real meaning and could easily be replaced by normal speech. Instead of "I am setting a boundary that people can't be my friend if they stand me up," just say "If people don't show up when we make plans, I stop making plans with them." In other situations, it is nothing more than a way to be mean or cold to someone while making the speaker sound confident or wise. "Person A, I'm setting a boundary that you can't visit me at work anymore" really means "Person A...I know I invited you to stop by my office, but it isn't fun for Me Me Me, the center of the universe, anymore..so I'm pushing you aside." If Person A really has become a problem or it turns out I'm not allowed to have visitors..a simple, normal speech, "Person A, you can't visit me if you're going to disrupt the whole building like that" or "Person A, let's meet somewhere else...the boss doesn't really want me to have visitors" would do.