"One of the big mistakes Extraverts make is to assume that if someone is not engaged with another person, that individual is simply not busy. So, it's okay to interrupt someone sitting and reading because that person is probably reading only because there's no one else with whom she can talk. You can only imagine what an Extravert thinks of someone who is sitting there not even reading but merely reflecting. Clearly that person needs to be put to some more useful task - such as listening to the Extravert's thoughts of the moment."
p. 97, Type Talk at Work, Kroeger, Thuesen, and Rutledge.