Same reason germany is most popular country in the world.
We don´t like USA. I think even less about USA than China. The sad truth is, that europe is the center of humanity and culture. All other regions are barbaric. Some more (China)...some less (USA). Unfortunately not evry society reached our cultural level yet. Humanism, art and science.
To be serious, i can´t imagine a honest partnership with China. China knows no human rights,. Individual life is worthless in China. China never had a Renaissance or enlightment. I expect nothing positive from your people. I don´t see a trustful relationship with China and i say that in all honesty.
We have a good relationship with Japan. They are a partner in the ISS and we trust them. I don´t think we could trust China. Loyality and friendship are unknown in the chinese culture. Thats why i think so bad about it.
Show me a single thing where you did something good for us.