I simply find it amusing that the people in China are only so hostile towards Japanese.Why? LOL
Looking into history, China was invaded by Germany (Siege of Tsingtao - Wikipedia), Italy (Italian concession of Tientsin - Wikipedia), France (Sino-French War - Wikipedia), United Kingdom (Opium Wars - Wikipedia). Just a few examples.
The Brits were especially the worse ones with the opium drugs.
Of course, the Japanese invasion was the most recent. Is that the only reason for why being so hostile to them? (Please note, not trying to be political, but trying to understand the culture from someone who is originally from that side of the story.)