First Amendment scholar David Hudson explores this question in his latest contribution to the ABA Journal:
In an age of declining civility and amplification of offensive speech via social media, it may seem strange, un-American or downright silly for people to be arrested for uttering profane speech. But it happens.
People can, and have been, arrested for uttering profanity in public, cursing in a canoe, engaging in a toilet tirade in their own home, or cursing near a school or church.
The full article can be read here.