Well hate is a strong word, but my grandparents and parents generation lived through Japanese occupation 1910-1945 so there is a lot of anti-japanese sentiment among the older folks. My parents never taught me to hate the Japanese .. the one thing I remember them telling me is that they were forced to learn and speak Japanese. But apparently there were other atrocities and things going on. Even to this day Korea and Japan are fighting over ownership of some islands. Most of my generation just try to get along, and it is a dangerous thing to generalize a whole race of people, but history is sometimes hard to forget.
Then their generation also had to live through the Korean war. Now communism is something that my dad gets real heated about. He tells me stories of Chinese soldiers marching through not really caring about the civilians, but once the communist officials started to take control, they would just start shooting anyone who dissented, friends and family.