I do NOT want to defend U.S. imperialism and I certainly am not happy about taking Trump's side on NATO financing, but IIRC the U.S. military contribution is somewhat larger than whichever country is in second place.
Trivia Question: The U.S. Air Force is the world's largest airforce. Who is in 2nd place?
Well, I think that it's fair to criticize our ally's military spending. But do you really think that us spending more than our ally's is imperialism? We're not spending money in Nato trying to encourage Nato to invade other countries (Russia). We're just trying to stop Russian imperialism. Is part of it trying to preserve our ally's ability to buy our goods and trade with us. You bet. But that's not at the same level of taking another country's land and killing its civilians.
If I were to complain about U.S. imperialism, I might point fingers elsewhere than at military spending.
What about the U.S. negotiating a restriction on film-making subsidies, claiming that it would restrain free trade, and thus inhibit cultural diversity, to allow countries to subsidize their domestic film-making?
Subsidies inhibit diversity? Hah! The net effect is that Poles have fewer Polish movies to watch, so end up watching more Disney and other Hollywood movies.