That has nothing to do with sloppyness.
If you know how to teach writing, publish a book and harvest a noble price. (Strictly speaking, that should be spelled Nobel, as that was his name).
As far as I can tell, people complain about spelling errors. But no one is able to teach how to avoid them. I'm tired about that. If I had children, the first thing I would do is bribe a doctor in attesting that they are legasthenics. So they don't have to go through the 'writing hell terror' I suffered as a young pupil.
As far as I can tell: superior reading skills cause you to make more writting errors, but perhaps that is just me.