The Iranians are of insufficient stature to play with the big boys and are relegated to "the porch".
The US Navy does not even notice their presence at sea other than to note they are a potential collision hazard.
Just like a unflagged freighter.
Yes. I saw a rundown of Iran’s navy, which seems to be made up of small coastal patrol boats. Who knows if Teheran is even in charge of them all? Could be provincials running their own shakedowns.