> a wilful mischaracterisation of his position
Perhaps you could present some evidence?
I paraphrased what he said accurately; 'he misspoke' is baseless and an insufficient explanation. His policy is America First, a term that purposely revived from nativists and isolationists of an earlier era. The President and his administration has advocated it over and over, in multiple forums. His national security advisor and (secretary of state or another high official) wrote an editorial asserting that there is no "community of nations", and that the U.S. will serve itself without significant regard to others' interests. They've also asserted, repeatedly, that the U.S. has no interest in democracy or the rights of others.
The parent's claims regarding Xi's speech are also baseless. Like Xi's predecessors and peers the world over for generations, Trump being the notable exception, he appears to understand that all benefit from the free trade regime and that the powerful nations, including China and the U.S., benefit most.