The point of this entire thread is that what you are calling "standard English" is not a thing. It's not what Shakespeare spoke and it's not what we speak. There is American Standard, the dialect primarily spoken on the news in the US and elsewhere, but that is one of dozens. Many of those, including the Elizabethan spoken by Shakespeare and ethnolects spoken my many millions of people today, employ double negatives for emphasis. You are trying to draw an old/new distinction which does not reflect reality.