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LLMs have a strong bias against use of African American English
(arstechnica.com)
This is a most excellent place for technology news and articles.
I'd say this is exactly where the LLMs problems with it comes from. For most of us outside of the US and even a lot of people there, it's exactly that - a caricature of a lower class black person. However for many people it's a legit dialect of English they speak every day.