Imagine Gautama Buddha had something against Tamils. Like seriously, he thought Tamils were everything that was wrong with the world, and Shakyans were good people and some day everyone, but not the Tamils, would realise this. Imagine he span elaborate metaphors about conquering Tamils through mind war, Tamils kept coming up to him and spoiling his meditation, Tamildom was an Unfortunate Rebirth etc.
This Buddhism spread throughout the world, even as far as Ruritania. Nobody in Ruritania knew what a Tamil was, and they enthusiastically believed they were basically some sort of invisible goblin. Ruritanian Buddhism flourished into a rich and meaningful religion, with much discourse about Tamils.
One day, centuries later, Ethnian explorer Joip Fãnzek went travelling and he discovered Nepal, still full of Shakyans. He was delighted to discover Buddhists there and shared some Tamil stories. The people there laughed and said “Oh yes… Tamils. They are rascals and blody basterds but my friend, you know, it has not stopped since. Since the Tamils, things have been terrible. The Yonas were even worse. And the offspring of the Umayyads are a curse unto this day! My own daughter fell in love with one! Remember the Mughals? I shall never forget! And the least said about the Bartanvi the better. Yes, it is a solemn religious commitment for we Buddhists to remember them, for they are all worse than Tamils! I will never visit a Tamil house”.
Joip was a little shaken by this, not least because he didn’t realise Tamils were real. He travelled south a little and found Tamils happily living there, and that they looked very much like Shakyans.
He returned to Ethnia and could never quite look at Buddhism the same way.