His Reasons
Sherlock only called John "Doctor Watson" in public when he would introduce him to people who proved difficult on a case.
It had taken John two months to discover why. He wouldn't have noticed it if had they not been on a case which required Sherlock to introduce John as Doctor Watson.
John thought Sherlock did this for two reasons, having a title provides nearly instant respect which could lead to John being given access to places normally shut off to others. It would be hard to turn away a doctor who was ready and willing to help others whether or not the situation called for a surgeon with combat experience. Being identified as a doctor also gave more weight to the person who accompanied the doctor, whether or not that person's own credentials where difficult to pinpoint or understand.
He shifted his stance as the last thought crossed John's mind as Sherlock stood in front of an unfamiliar morgue, trying to persuade the guard on duty to let them in to examine a body.
Although John never said this out loud, Sherlock glanced at him once then grabbed his elbow whispering, "Excellent deduction, Doctor," as they were ushered into the room.
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