Folks don't even know about the Kingdom of Kush, Great Zimbabwe, the Mali Empire (ruled by Mansa Musa, the richest person in human history adjusted for inflation), the Songhai Empire, or any of the other African nations which far outpaced the rest of the world in terms of wealth and technology. Heck, the Land of Punt was a mysterious African civilization dating back to around 2500 BC, called "the Land of the Gods", which was extremely wealthy and was so well hidden scholars today haven't been able to pinpoint its exact location. Sound familiar?
But it's much easier for these cacs to scoff like they know something than to learn about the real-world history that inspired Wakanda.