On September 18, the day that China commemorated the 85th anniversary of Japanese invasion in Manchuria, Chinese real estate tycoon Guo Bin posted on Weibo that he always leaves the water tap running in Japanese hotels to express patriotism. The anti-Japanese post set off a fierce discussion on Chinese social media.

“Our whole country was thoroughly bullied by a much smaller, son-of-a-b**ch country! I never use any Japanese products, and I even leave all…