We're not going off of anything. Neither you nor I have any influence over the situation, I simply pointed out a glaring flaw in your logic. Why can't you understand that? The last 6 years of "Europeans pay more when converted straight across, wahhhh" has gotten old and still hasn't changed a single thing. It's time to stop whining about it or stop paying. Though if you stop paying, I'm sure we'd all also appreciate if you stopped whining about it.
Also, no, China doesn't. The US has a GDP of $17.3 trillion USD. China has a GDP $9.18 trillion USD. They've still got some catching up to do, though I'm sure they will before too long. Since you made the claim, I'd expect you to post some sources, but instead I'll help you out so you don't have to and source my own claim.
Listed by GDP nominal, where the EU has to combine 28 countries' GDP to barely come out ahead.
And here it is listed by GDP PPP.