I'm going to reply to Blackstone and Jeff together.
The central problem with the American position is that the US is not a party to UNCLOS but attempt to benefit from UNCLOS, refuse to action through UNCLOS institutions to resolve differences with countries (as it advice Philippine to do), instead use unilateral military actions (Freedom of Navigation Program) to try to enforce its unilateral interpretation of international laws. In essence, the US is acting as plaintiff, prosecutor, judge, jury and executioner all by itself!
American vs Chinese difference in interpretation of EEZ regulation is just one of many dispute the US have with numerous countries in the world, as I have shown in my previous post. Even if we overlook the larger picture of American disputes with the world, and just restrict ourselves to EEZ disputes, China is not alone in the world.
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As everyone can see, India, which the US frequently bring up the antithesis of China, has the exact same position as China. While, Philippines, an ally of the US, go a step further to forbid all research and survey within its EEZ. If you go back to Panasian's post in the SCS stragety thread, you'll see that ironically the US unilaterally challenged Philippines claim more than any other countries, including China.
While China reject the authority of UNCLOS in its dispute with Philippines specifically due to the unresolved territorial dispute which is outside the jurisdiction of UNCLOS, the US rejects the authority of UNCLOS entirely, and attempt to enforce its own interpretation of international laws through military muscle alone. That's the problem with an unipolar world.