So basically now we have America accusing China of using slaves to pick cotton, Japanese saying China is populist and militarist, Canadians saying China oppresses indigenous people, and Indians saying China has a caste system.
So basically China is a mirror.
I don't feel the slightest sympathy for that Chinese couple being harassed online by the Japanese public. Yes, they were innocent—just dancing in front of a store. In most normal countries, that would be seen as a lively, youthful expression of beauty. But Japan is not a normal country.
The Chinese government had already issued a travel advisory, warning Chinese citizens not to go to Japan. They chose to ignore that advice. They had to learn through their own experience—"never again to Japan." That doesn't deserve sympathy.
Japanase are people If you deliberately try to please them, you'll always end up on the receiving end of their criticism. If you want to earn goodwill from them, you should take a page from someone else's book—someone like LeMay.