I can see your points, but I wholeheartedly disagree with endorsing the word "ain't". It's grammatically incorrect to its core. It supposedly is a contraction for "am not", but since "am not" is preceded (correctly) by only the word "I", "I'm not" works just fine (and is grammatically correct).
When people say, "He ain't..." they're turning "is not" into a grammatically incorrect form of "isn't". If they're using "he ain't" as a form of "he am not", well, that's just even more wrong.
I've yet to see a example of "ain't" that is grammatically correct. If someone can show me one, I'd be happy to entertain the idea of "ain't" becoming acceptable. Until then, I'll just go on cringing every time I hear/read it. (And unfortunately, that's pretty often.)
/off soapbox
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Never let the facts stand in the way of a good answer. -Tom Magliozzi
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