Keep in mind that we once had many battleships in the fleet. They were rendered obsolete by the airplane.
Battleships are very fat targets in this age.
Bismarck and Musashi were eventually sunk by bombs. Then there was the near-successful attempt sinking USS Cole reflecting the potency of asymmetric warfare, and of course current drone technology which, if Ukrainian boat drones are able to sink large Russian missile cruisers, what more with a battleship about the size of an Iowa?
He’s in it mainly for the belief he wants to show a bigger e-peen.
Battleships were rendered obsolete by the airplane but also by radar and radio.
Even in their heyday, battleships never went out alone. They were always protected by smaller ships like destroyers. A WWII battleship cost about $100m to build (about $2b in today’s money). A destroyer was only about $6m. Destroyers evolved from something called a “Torpedo Boat Destroyer”, which was a ship built specifically to kill torpedo boats. Torpedo boats were small boats that either launched torpedoes, or in the earliest days carried torpedoes affixed to the bow which they’d use to ram high-value enemy ships. In the “rock, paper, scissors” world of naval combat, a really cheap torpedo boat could take out a really expensive battleship, but the torpedo boat was countered by a (torpedo boat) destroyer.
Battleships come from a time when the only way to spot an enemy fleet was to see them visually across the water. It used to be that an entire battlegroup could “hide” by just chasing off or killing whatever had spotted them and then changing course. The ocean was a big place, and spotting something visually was really tough. Add night, clouds and weather and sometimes ships could be only a few km away and never spot each-other. By the middle of WWII radar and radio improvements had changed that (the radar for spotting, and the radio for relaying the information on what you found).
Radar makes spotting any ship nearby easy, even at night or in bad weather. Put that radar into a plane and now a tiny plane can spot and track a huge fleet, so it can no longer disappear. With the ease of communication with radio, that means that if the enemy fleet is too powerful, your fleet can stay in port or otherwise avoid it. If you have submarines (the modern version of the torpedo boat) you can try to set up an ambush.
So, even if airplanes didn’t exist, battleships would probably still be obsolete just because of radar and radio. And, up next, carriers will become because of drones and missiles.