That's really not true. Taiwan, for example, has widespread pro-Japanese sentiment. Indonesia, Thailand, the Philippines, and Vietnam also have warm relations with Japan.
On the other hand, Mainland China and both North and South Korea continue to have a dominant anti-Japanese sentiment.
A cynical observer might suggest that the ability of a nation's public to forgive past grievances correlates closely with how much benefit the government sees in maintaining that hostile sentiment.
> both North and South Korea continue to have a dominant anti-Japanese sentiment
I've learned it's extremely difficult to find Samsung products on the shelves in Japan. The conglomerates in East Asian are intertwined with political influence.
