I think there are stages of perception: 1. When all you know or notice is yourself; 2. When you think everything that you have felt applies to others as well; 3. When you realize that others can go through the same thing as you but not feel the same way as you did; 4. When you can put yourself in other's positions and understand what they feel. Everyone knows Stage 1 is obnoxious, but people stuck in Stage 2 can almost be more so, because they think they know something about you.