Why do Japanese hate Chinese so much

I am confused. Who hates who? I guess I will sum up the whole topic in a nutshell.

In this world we have likes and dislikes:
In Canada we have French and English speaking citizens, some dislike the french, some dislike the English, Some hate the french, and some Hate the English.

In Japan Some people dislike the Chinese, some Chinese dislike the Japanese, Some hate the Japanese, and some Hate the Japanese. 

It is somthing that is an issue in EVERY country around the world. 

Your question is why?

In my opinion it is from a lack of understanding, and a laziness to learn about thy neigbours.

Classic example ME! 

My family never raised me to be racist, but in my country there is a slight, (how can I phrase this...social norm??) where English speakers dislike the french, frown upon the Chinese imigrants, hate the hindus for taking jobs...ect. ect. ect.

So during my teenage years I made comments about these issues usualy negitive... and now, I see were outright wrong.

In my later years I made up for my missunderstanding is the best ways I could think of, i.e. Volunteering to help those new to my country. Teaching English for free! ect. ect. 

Anyway my point stop asking why? It just is that way. Instead start thinking and learning about the people around you. One person at a time.

The world be a better place if everyone would stop asking why. why, why, why, why, why...and start saying Hello, Hello, Hello, Hello.....

Just my opnion Take it or leave it!

 

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My parents said to me that Japanese people have always been malicious people, Japanese people have killed enormously Chinese people during the WW2 !!! I think that's why Japanese and Chinese don't like each other !!! But I say it's stupid, Japan and China are like brothers, we eat rice with chop sticks, we have almost the same culture, and physically we are same !! that's very idiot, I have a dream, I hope one day Shinzo Abe and Hu Jintao will be friends one day haha ! Even I hear stories saying that Japanese don't like Chinese or Chinese don't like Japanese, I love Japan I respect Japanese people.