Really? It’s usually pretty easy. And plus Chinese mainlanders hate the Japanese. Go live in China and you’ll see like every movie and tv show portraying Japanese badly. Mostly though historical movies and shows that have some anti Japanese sentiment. The Japanese aren’t fans of the Chinese either. So much so my friend who’s a diplomate of Korea in china for a while has said both countries often use Korea as the mediator for Japan and China to get things done diplomatically.