Don't be a killjoy.
Even as the Titanic sank into the icy waters of the north Atlantic on a cold April night nearly one hundred years ago, the band kept playing.
So, let 'em have their fun - if we're going to go down, at least, let's go down fighting, singing, and having fun.
I totally agree! Life is way too short, not to be silly.
In other words, let the juvenile boys be juvenile boys.