Actually if its used in public, it is possible to prosecute under defamation of character (lawyers can confirm it). But,a) Its used between known people at a friendly levelb) Its used between known people for a brief skirmish, but they tend to forget & forgive and/or keep in mind for a later hit backc) Its used between strangers for a brief skirmish. Nobody wants to take the time & effort to run behind each other for worthless issued) The issue has worsened to the level of fistfights & more, at which point, the use of unparliamentary language seems hardly worth thinking about compared to the bigger stuff.For the record, I neither use, nor am I comfortable with the usage of the language in my presence.