Part of the justification for tarriffs is that America is somehow being 'taken advantage' of by the rest of the world and the tarriffs are the rest of the world finally paying their fair share. The reality is that (until now) America has had a uniquely privileged position in the world economy that got America, in general, very beneficial trade deals.
He's commenting on the attitude driving the tariffs.
Uniquely privileged position?
The only unique thing about America is free markets. Any country can become highly successful by enacting free markets. The only thing in the way is their disbelief that they work.
There's a common thread across the world and history. The more free market a country is, the more it prospers.