This is what the US does that irks China

http://english.peopledaily.com.cn/n/2014/0828/c98649-8775584.html

Would the US like it if China did the same off its San Diego?

China had already shot down one  its spy planes to show to the US that it did not take kindly to such spying.

China in her recent history was crushed by the Imperial Powers from the mid nineteenth century from the state that for millennia was economically the most powerful into penury and subjugation, and amidst these imperial powers was the US. To do this today is very threatening to China.