You are being bigoted or ignorant again. There is a whole meme of people with Indian accents, explaining things on YouTube, and Americans genuinely appreciating their lessons because American teachers with perfect English like yours have failed to explain the subject properly
I find it harder to learn if I have to decipher the words not the content. This is true for lots of different accents. This is a common experience for those not overindexing on ethnonarcissism.