Public order offence here; UK. But I don't see how it makes sense to do that over a little tiff, or even how it could be practically enforceable unless the policeman was right there. I mean what are you going to do; film all your life incase someone says a mean word to you?

Well, in my country's case, you could have a witness willing to testify as to what he heard. Happens quite a few times, especially from litigation-trigger-happy people.