You say > On the other hand, I believe "I ain't do any drugs" is ungrammatical in AAVE But the OP says > "I ain't do any drugs" is a normal, grammatical sent

You say > On the other hand, I believe "I ain't do any drugs" is ungrammatical in AAVE But the OP says > "I ain't do any drugs" is a normal, grammatical sentence in AAE And you concede that the OP is an expert and you are not. For what it’s worth, and it’s not much because I’m neither a linguist nor a native speaker of any kind of English, I consume a lot of content made in AAE and have friends who speak it, and I would not bat an eye at seeing or hearing ”I ain’t do any drugs”. I think your interpretation of the grammar is too strict.