And back to the original question ... And why is this "pretentious"? Would you call a Catholic priest "Father" outside of church? Or a military officer by his/her rank, off a military base? I'm not understanding why earning and using an academic title is a sign of pretentiousness. I'm sure there are times when you insist on being addressed as "Mr. Arch" as a sign of respect. "Mister" is an unearned honorific with history back to the hierarchy of English nobility. Again, there certainly are times when people go overboard in their insistence on being addressed in a particular way. However, to universally declare that all "out-of-workplace" instances of address are automatically inappropriate seems overkill to the opposite extreme.