here is my experience with the question "who the hell do you think you are" when i was a child, i was a foster child. i moved in with the childs. arwyn, alyssa, and shannon. one time we all went on a vacation. one of the only times we did. when we were on vacation, arwyn pulled me aside to confront me about something. i dont even remember what it was, but it was nothing i am pretty sure because i dont remember talking very often when i lived with them. but when she asked me "who do you think you are" i said, i dont know what you are talking about. i didnt do anything wrong. then she said " welllllllllllll, i will tell mom (shannon) that you did this thing right here when you didnt actually do it. " she said to my face that she was going to falsely accuse me of doing something and she was going to do it on purpose. so my association with the phrase is "who do you think you are? is followed by the same person telling me to my face they were going to falsely accuse me of something on purpose i dont remember the details of the situation but i remember she found me alone in a hallway somewhere where we were on vacation and was like "who do you think you are" and i .still. do not know what she was talking about