Well done, geniuses. And how many battleships are currently serving with the navies of the world? With the Yanks having retired their last ones years ago I think the answer is very roughly approximately none. Yes, America has aircraft carriers to sink, but you don't need to sink one to put it out of business - you just need to do enough damage to bugger its ability to launch aircraft. I'm no expert but I guess that might be the reason the Yanks don't let them sail around on their own but supply each carrier with a bunch of other ships to support and protect it. All of which makes me think this 'sink a battleship' stuff is more about willy waving than anything else. No doubt it will go bang nicely if it hits a ship that gets within the 125 mile range but realistically that's not going to be the US Navy all that often, and it's not going to be anyone with a battleship except time travellers from the past. Tankers and freighters on the way in and out of the Persian Gulf, yes, but why make a battleship sinking missile for that?
No, I think this is more about giving the rest of the world the shits, and the only sensible response is the mature and dignified one. We all run up to the nearest Iranian embassy and yell "H4, H5, H6" at the top of our lungs and then run away again.