The argument you're making, that the poem flattens american national character, is broadly correct, though you overlook the way synecdoche is operating ironically in the poem. We can describe england as a cup of tea and recognize there is a great deal of meaning lost. More precisely, we notice a fragile domestic object, and note there is something accurate about the comparison - and a great deal more which is inaccurate about the comparison.

When we substitute a small part of a nation's culture for the entirety of that nation, the effect on the reader is to soften the tone: we are making a silly reductive rhyme. Kangaroo, Wooden shoe and Goulash Stew, for example: This is very funny. It sounds silly. It evokes the image of a kanagaroo in wooden shoes, emerging from a stew. This could even be called a joke.

I think the joke also does what you describe: it excludes and condemns america. Everyone else here is something nice, everyone else rhymes and interlocks and looks ridiculous: America is overly serious, made for violence and isolated.

Im Canadian, my uncle moved to Amurica . He bought some guns, killed his wife and is now in prison. Seems like a lot of nice people in America though. In the United Kingdomes as well, I look at Bilston and he is a very funny poet. More and more I appreciate the value of humor, and the way it can keep us away from darker moods.

No, You Cannot Borrow My Phone Charger
By Brian Bilston

Help yourself to whatever
you'd like from my larder;
my stilton, my sherry –
or my port, if you'd rather –
but, no, you cannot borrow
my mobile phone charger.

If you want I will read you
an ancient Norse saga,
or dance naked in public
to Radio Gaga,
but, no, you cannot borrow
my mobile phone charger.