What's wrong with a grammar nazi or spelling police?
In this day and age, they're needed. Our educational system is failing our children and apparently failed our adults as well. So, it's never too late to educate anyone.
Bring on the grammar/spelling police. If people don't like being corrected, do it right the first time and there would be no need to be corrected.
The key is to determine which is a typo and which is not. 4951