This woman decided to visit an expensive department store and spy on the other customers while they shopped. If only she had decided to mind her business, the internet wouldn't be roasting her ! After a shopping incident, Karen felt justified to post to r/AmItheA**hole – she was so sure she was in the right, but she just wanted to be sure. As she explains the story, she went for a shopping trip in Bloomingdales, and noticed two teen girls who found a pair of super expensive boots , and decided…