How do you deal with energy draining vampires?

I have grown up and currently live with a vampire. In the thirty or so years I’ve lived, I have learned that people like this will always continue to view life in general as grim. One way in which I have thought of dealing with this person is to stop living in their world (listening to them) and giving the person advice. Has anyone experienced a person like this in their life, grown up with a vampire? What were your own experiences?