Also, 1 in 5 person in the world is Chinese. So it's hard not to make sweepingly stupid generaliations when talking about China.
When I was there, I stayed about 3 weeks and it was nowhere near enough. It felt like we only saw a glimpse of a place, at most. I was there with a friend, and we did get a lot of attention in the street, especially in smaller villages, but it was entirely positive. The only "bad vibe" we got was during that football game on Tienanmen square. One of the kids against us was overtly physical. He'd shoulder charge us, and stick his leg out, a bit aggressive but nothing awful. At some point we tangled for the ball, and he kinda fell over my leg. I held my hand out to help him up, and he kinda slapped it away. And that was pretty much it. He shook our hand at the end of the game. He clearly didn't like us, simply cos we were foreigners, but it was one of 20. And one tiny insignificant incident in 3 weeks is really not that much.