Speaking of stages, 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.