If that was the criteria, American exports would be in the toilet.
It's because China is a competitor. All the other bad actors are too rinky-dink to worry about.
It's both, because both are a threat to our standard of living. This is obvious. The question for you is why you would prefer to lower our standard of living and become subservient to a communist led genocidal government? Does that sound like a good path to go down?
Ok, but what about China?
Do you like being able to comment whatever you want about the government?
Hell, do you like posting pictures of a fictional bear without being treated as a criminal?