You can send them all to off (you did, so yeah), okay? Like, I totally get people who don't like bad grammar; I hate bad grammar. But there's a huge line between correcting an author when they make a mistake and bashing on them for doing it.

I think correcting grammar is fine, since it usually helps the author learn and improve (or catch any mistakes they overlooked while betaing), but it's all about the way you word things.