This type of saber-rattling would be comical if the United States wasn't busy destroying itself. China is encouraging pip-squeak Iran to mock Joe Biden and heap ridicule upon the most incompetent American Administration of the past 100 years. (Perhaps even longer but I feel compelled to draw the line at Woodrow Wilson).
In point of fact, the United States Navy remains, by far, the most powerful Navy that has ever existed. Even at the peak of it's global empire, the British Navy never possessed such overwhelming power over ALL of its adversaries.
I do not make this statement lightly. We know, the Chinese Navy now has more ships than the United States but they are much smaller.
In terms of 'tonnage', the measure of actual capability, the United States Navy is still larger than the next 13 nations combined (and half of those are our allies, or alleged allies). BTW,. Iran doesn't make it into that list... it is somewhere around number 18 or 20.... depending on how many of their own ships they have grounded or sunk recently. meaww.com/iran-destroyer-missile-hits-own-warship-gulf-of-oman-exercises-feared-dead
The picture below shows an American Strike Group. By itself it can rival any nation on Earth (except China in its own waters). AND... There are TEN more just like it.