It was more of a tongue-in-cheek comment.
The "harm" argument posed by libertarians can lead to interesting interpretations -- such as the drunk driving one. Let your imagination run wild and you can come up with many activities that don't harm others. Cursing in public, walking around nude, mastubating on a park bench, spitting on the sidewalk.
Offensive? Insulting? Rude? Obscene? Yes, yes, yes, and yes.
Harmful to others? Nope.
Offensive? Insulting? Rude? Obscene? Yes, yes, yes, and yes. Harmful to others? Nope.
Well, if it gets in your eye...