Sometimes I wonder about the people reading and posting on here. What do they look like, how have they time to do this, and so on. (I'll come clean: I came downstairs in my dressing gown because I wanted a cup of tea. I am also seeking distraction from engaging with the difficult things I need to do today. So I thought I'd look to see what might interest me on GN.) Because we don't really know each other, or see each other face to face, it is harder to pick up on the equivalents of intonation and body language. Probably those who do the correcting just don't understand/appreciate the effect of their posts on OPs. Would they behave like that if we were all together in a room? (Of course, we wouldn't hear spelling mistakes; but there would be word choices and lapses of syntax or grammar they could point out. And if they did, I imagine most of us would cold-shoulder them.)