What's wrong with children saying bad words?

Is it ok to say bad words, curse words, when playing games, with your guy friends, while burping, while doing guy things, accidentally, in the heat of the moment, for fun, randomly, via freewill?

Hey everyone! This is an original song named Cut It from our unnamed metal band, because every name we've thought of ends up being taken haha. We're a quartet from southern Missouri and play everything