Media outlets have carried a recent story about an Australian man who flew from that country to Singapore. En route, he became involved in an argument with a fellow passenger and directed profanity at the individual.
The abusive passenger was met upon landing by Singapore police because his language was a violation of a Singapore modesty law which was in effect on the airliner, the penalty for which is imprisonment and/or caning.
I somehow suspect that if a similar law were enacted here, that the American Civil Liberties Union would have something to say about it. I am not going to endorse a prison sentence or physical punishment for those that are coarse, crude, and vile, but I like the spirit of those in authority in Singapore, who have taken some action to ensure a society of civility and respect, something which long ago was sacrificed on the altar of free speech in the United States.