Even the best writers need proof-readers; and the best ones KNOW it.
In the field of psychology, the Dunning–Kruger effect is a cognitive bias wherein people of low ability suffer from illusory superiority, mistakenly assessing their cognitive ability as greater than it is.
Special snow flakes have a big problem with this. They are all above average, they are all smarter than you, and they certainly don't need an editor, because they write gooder than any editor.