Please don't take this the wrong way, but you could not possibly be more mistaken.
Dialects have their own rules of usage, grammar, syntax and semantics. They spring naturally from the human tendency to invent and adapt language. This is as natural to our species as breathing. This happens
everywhere,
especially on the street, and largely as a social marker to differentiate yourself and your group from others. AAVE is a particularly complex dialect, whether or not it is spoken in the "ghetto" or elsewhere.
Very few people even know what a dialect is, but that does not keep them from actually speaking it. If you doubt that, see how long a Wall Street Banker who only speaks SME can try to pass himself off in South Central LA as a local gang member. The dialect and subdialects alone are so sophisticated that the users can distinguish between regions, ethnicities and sometimes even gangs. The dialect is a powerful social marker with a complexity at least on a par with any decent security encoding.
AAVE is one of the most heavily-studied dialect in modern linguistics, and the notion that it is "slang" or "lazy talk" was discredited years ago. But like I said, this is a VERY common belief in many cultures among those who only speak the dominant language. The French discriminate against speakers of the colonial dialects; the Eastern Ukrainians discriminate against the Western Ukrainians and the Russians pretty much discriminate against everybody. But we are not very far behind.

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