I would say Bataan and PoW camps in SEAsia as well as treatment of mainland Chinese, Korean laborers, etc., are "better" examples of Japanese bigotry and cruelty --at the time. Japan has come a long way since then.

1 in 3 PoWs in Japanese labor camps would die during WWII: https://www.historyonthenet.com/world-war-two-japanese-pow-c...