system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do all of the east Asian ethnicities seem to hate each other?

I understand the cause of animosity between Japanese - Chinese - Koreans, but what about all the other ethnic groups?
gpt
They don't hate each other (well, not too much). They all hate Japan. During the second world war, little of east asia was left untouched by them, and they committed war crimes left right and center everywhere they went as if it was their god given responsibility. The animosity continues to this day partly because the government actively stokes it (in the case of the PRC, for example) but mostly because of the modern Japanese government's refusal to acknowledge said crimes (imagine if Merkel claimed the Holocaust only had a few dozen victims and regularly visited the grave of Heinrich Himmler to pay respects).  

Various amounts of animosity remain between the rest of the east asian countries for various cultural, political, and historical reasons, but it's all chump change compared to how everybody feels about Japan.