I've been mulling that same thing. The USA is acting like an entitled, spoiled brat 10 year old, acting like an entity that can and will demand anything from anybody.
Why would the World not rebel against the petulant whims of the
USA ?
Americans have really not totally felt the fact that we are spending
like a drunken sailor. America has no fiscal discipline. The World
has ignored that over the last few decades, maybe because the USA has
played the role of peacekeeper and facilitator of stability and order.
All of that is gone under Trump.
It doesn't make much sense that the rest of the World is going to just
bend over and take it from the USA, now that we are acting like
a neurotic, crazed lunatic.
And sure, the USA can "print" dollars to its hearts content. That does not mean the rest of the World can't start demanding many, many
more dollars for purchases made in US Dollars.
Trump is playing with fire while surrounded by gasoline. He has the
emotional maturity of a spoilt 10 year old Richy-Rich kid who has never heard the word No.

link is to the list of buyers of US Treasuries. Definitely see
EU Country's, and China on the list.
ticdata.treasury.gov - Data chart center