Do you ever use the wrong word in written conversation? Do you put ‘there’ when you mean ‘they’re’? ‘Your’ when the sentence clearly calls for ‘you’re’? Are you guilty of dropping an ‘o’ from ‘too’ when you shouldn’t?
I’m the kind of pedant who hates these kinds of mistakes. This doesn’t stop me from making them, of course, but hey, that’s my perogative. To encourage others to make less mistakes of this type, try this quiz, and if you don’t get GRATE, then submit yourself for re-education at the earliest opportunity.