Play Nice or Go Home
I was shocked to read an article advising people how to "break up" with those who annoy them. See the original article here (it's pretty short).
The article suggests taking steps: first issuing a warning, then gathering ideas and evidence to state your case, then cutting ties if the person refuses to concede.
I find the aforementioned method condescending, to say the least. I can think of a few situations where a person is an addict or has otherwise destructive habits. In that case, intervention is important... +/-