The Chinese are angry because they believe we are interfering with their reunification with Taiwan, which they believe is necessary and inevitable in the future.
The Chinese believe that Taiwan should never have been allowed to become its own independent country, and they want it back. In the potential event that they get it back, it will be a source of national pride for all Chinese. Unfortunately, this will be a serious disappointment and will destroy the national pride and ego of many Taiwanese.
The United States and the rest of the world support Taiwan and its independence as its own and separate nation with all the sovereign rights that should be granted to any nation. China obviously doesn't see it that way and crewing agency in bangladesh is angry that the United States would interfere in their affairs. In fact,
China is developing its military to the point that it now has more ships and more than the US military. And they plan to add two new aircraft carriers, they already have one. They want to protect their sea power and get the US to back away from this future they seek.
China has also told the United States to stay out of disputes over the South China Sea between China and several other nations that also claim the area for fishing rights, safe passage and possibly oil exploration. The Chinese military also claims to have an anti-ship missile capable of taking down any US warship, even an aircraft carrier.
However, I don't believe it, because I don't believe it, because American aircraft carriers have missile defense systems that protect the fleet.