The title is kind of a long story. And an old one. So old that the “inside joke” it is referencing hasn’t really been referenced since at least Harry Potter and the Goblet of Fire was published and certainly before Harry Potter and the Order of the Phoenixwas. Why does Harry Potter matter? Well, have you read the title?
No, it has nothing to do with “being above” those who would love to receive a Hogwarts letter. At the time of it’s creation, my sense of irony and sarcasm wasn’t that well developed.
It comes from around the time Harry Potter and the Chamber of Secrets was published. My friends and I, being avid readers with very active imaginations, latched onto Harry Potter and began imagining what we would be like if we went to a magic school. We even matched our classes with those from the books to the best of our abilities. Then I wanted to have my moment of uniqueness and decided I wasn’t a witch, but some other type of magic user that as far as we know, doesn’t exist in the Harry Potter world. IIRC, it was some time of elemental user a la Avatar: The Last Airbender, but, of course, long before that series was broadcast.
At the same time, one of my guy friends aka my crush was Harry Potter fan. He also happened to be British, which might’ve worked quite well for him had we been a few years older. Along with some of our other guy friends, he was loosely involved in the imaginary Hogwarts play, so he knew about my desire to be the special, little butterfly in the game. Because we also had a slight rivalry, we tended to “talk smack” to each other. So I started to call him Mr. I’m-Too-Good-To-Be-American. He retaliated with Miss I’m-To-Good-To-Be-A-Witch. And that is where the title comes from.