The reason that we can see this is that we can see past our noses. The reason Michael could not is that he makes Quincy Magoo look like he has Superman's telescopic vision. Instead of admitting to himself that he too had to adjust to things like everyone else on the planet and thus had to absorb a little ribbing from the other scruffy, irrelevant little imbecile children that infested Fourth Grade, the same jackass who committed the cowardly, hateful act of breaking up with someone by e-mail bleated "How could you do this to me?!"
This is because he to this day is constantly being blindsided by the discovery that other people have wants, needs and dreams that matter as much to them as his do to him. I don't really think that he can remember this fact from one day to the next because there doesn't seem to be a part of his mind that can understand that things mean things to other people too. Always and ever, he witlessly offends people by not seeing that the world doesn't disappear when he blinks.