Double negation is also a feature of modern English; the point is no one can claim speakers of Middle English, French, Afrikaans et cetera are ignorant or unintelligent.
I don't judge any particular speaker of French or Afrikaans to be ignorant or unintelligent. I do however judge that while they are speaking French or Afrikaans they are not speaking English.
If you have criticisms, that's fine, but again, this is the scientific consensus and not my area of expertise-- I'll have to direct you to Wikipedia.
Not that there's anything wrong with having a standard language for business or politics, as long as you don't think that says something about people who grew up in the wrong place or class.
There are some obvious issues with confusing these things.
But the speech isn't in "many languages", it's in a particular language where the double-negation is considered incorrect, therefore there's no need to make assumptions about race or background to consider the speaker ignorant.
The speech is correct.
To be clear on what I'm saying, an AAVE speaker can attempt to speak some other dialect and fail, producing broken constructions similar to non-native speech. But almost none of the speech labeled as such falls into that category.
Not to mean that says anything about double negatives, but French probably shouldn't be used as an example of them.