Ever hear of "at will" employment? The expectations of the company were set at this interview. No one was excused from doing what was necessary or beneficial to the company because of job description.
Obviously there are times when high level people are needed for things other than making coffee, but the principle stands.
Right. The only reason anybody SHOULDN'T make coffee or answer phones should be based on comparative advantage -- they can be performing a function at that time that is more valuable to the company. No one should think they're TOO GOOD to answer the phone, because that's the attitude that rots companys from the head on down.
If everbody has to take a turn answering the phone so that that lesson isn't lost, that might be a highly valuable use of their time.