Earlier quoted context omitted.
You can't rename most Bluetooth speakers. "Bomb" was the name the selling brand gave the speaker. By making everyone turn off their Bluetooth, the kid whose speaker had turned on probably couldn't even see the device broadcasting the name. People linked to one by a company made Hellotec but Hama has a similarly named device, and plenty of other speaker manufacturers try to make a pun out of "boombox" by naming their…
Rename is a fairly common feature on Bluetooth speakers and headphones, for example my Bose NC-700.
Otherwise, I trust many folks in an HN comment section would reminisce on stories from their earlier years, where they'd rename the Bluetooth devices around a densely-populated area to cause mischief.