But how would I even come into contact with a mainlander in the first place?
If you were USA-born, you'd have grown up in the last days of USA cultural inertia, and thereby saturated with its cultural assumptions, not the culture of the rising periphery.
And, extrapolating from your circumstances now, no matter how much you might come to admire China in that reality, you'd likely still have no means of traveling and integrating there, so you'd have no way to be sure you truly loved what their culture was really
If you've never lived it, you can't know you like it.
(The converse does not apply to hating something unknown, because all else equal, it's rational to stick to what you know.)
Whereas children born successive decades in the future will be more and more influenced by chinese culture, due to shifting locus of world power.