There is a concept termed diglossia worth exploring in relation to dialects of African American English used in the United States.

What is diglossia?

Diglossia can be defined as “the coexistence of two varieties of the same language throughout a speech community. Often, one form is the literary or prestige dialect, and the other is a common dialect spoken by most of the population.”

Britannica, T. Editors of Encyclopaedia. diglossia. Encyclopedia Britannica. https://www.britannica.com/topic/diglossia