It could e.g. be "anti-democratic" by a universal definition of democracy and civil liberties which no single country then gets to fork and redefine...
Let's suppose you had your way and the cultural concept of America as a set of ideas and values related to democracy was erased. Would the universal non-national concepts of democracy and civil liberties have been able to inspire Mike Pence to stand up to Donald Trump on January 6th?
its encoded in the US constitution, so its anti-american.
it can be anti-other things too, but its certainly anti-american