That was my first thought. Who says they are directing whatever you think they are feeling towards you? Why does your world revolve around the fact that "people hate me because I am fat whhaaaaaa"? If someone is standing there like a moron next to a lunch sign, I'm going to look to see what the hell they are doing. "Maybe the sign has something funny on it. Maybe superman just fell from the sky. Oh, no, just a fattie being a tourist moron". It's called being aware of your surroundings, and it is NOT always negative.