It's wrong for people to misrepresent themselves to others.
John is at the baseball game when the person beside him introduces himself as Dave and asks John where he works.
John wants to respond to Dave's question.
John tells Dave the truth, that he is a male flight attendant.
John tells Dave that he is a supreme court judge, but that his nomination hasn't been made public yet due to technicalities.
Dave respects John for telling the truth, and asks John if he has any flight discounts he can hook up.
Dave obviously knows John is lying as there are no secret supreme court judges, and immediately becomes uncomfortable sitting next to John.