Lisnaholic

^ I must try to remember this next time you go full grammar nazi on someone.
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Yeah, I get what you guys are saying, and OH's image of a little girl and her mum's English is a good illustration. Not always, but I often try to squeeze in the word "grammatically" when I'm correcting students. I'm not judging them or their ideas, I hope I'm making a neutral observation that they are not using what is known as accepted grammar.
Ideally, teachers should also explain to students how there are different tones and formalities in English. In formal written English you should use accepted grammar, but what OH's little girl and her mum say at home is entirely their business. So the little girl's mum's English is not "wrong" it's just not appropriate for advancing academically.

Also, of course, I have the advantage of teaching smallish groups in a less charged atmosphere than OH's classes in the US. I don't have to cope with that tension between social class, race and type of English, but if you explain about appropriate tone for different situations, perhaps some of that tension can be diffused.

And finally a note on corrections. Plenty of teachers (even me on a good day) use this method:
i) get students working in groups,
ii) prowl around with ears/eyes open to notice important errors
iii) when students have expressed their ideas, put some of the errors you noticed on the board
This way you can correct grammar without embarrassing/interrupting individual students.

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"Am I enjoying this moment? I know of it and perhaps that is enough." - Sybille Bedford, 1953