We have right now a whole different world of young people dropping swear words, and not even thinking about it.
Our values have become dramatically & shamelessly compromised.
It is in my opinion not acceptable, and only by instilling good manners and explaining to children that it is not expectable to swear, will they get the message.
You have to be mindful what they watch on t.v. at certain times.
I would never allow it with my three sons, and instilled in them good manners, not just for our home...but anyone they came into contact with.
I feel it is the job of a parent to insist on certain rules.