As with the sheep I mentioned earlier, it does all come down to sex appeal and I think some of us don't want to accept that, or want to think that human beings are not subject to the same biological drives as other life forms.
Don't take me wrong, I don't mean that sexual signalling and sexual-toned behaviour (such as wolf whistling) should not be curbed to some extent in order that society can run in a civilised fashion and in order that men and women can live together.
BUT, I interpret wolf whistles in the same way as I interpret women's efforts to make themselves look as attractive as possible. We kid ourselves it's for our own sakes. It's not. It's to enhance our sexual attractiveness because that's how life works. So, I'm not criticising people who want to make thmeselves look attractive. Most of us do. I do. It's normal. We may differ in our taste as to what attractiveness is, but we all do it. Similarly, there are some male behaviours that some of like and some don't. Wolf whistling is one of them, as has been made obvious by comments on this thread and on threads in newspapers. Did anyone see the Guardian's take on the Poppy Smart story yesterday — contrasting articles from a series of people which, if nothing else, showed that it's not something everyone will agree on however many times we dance around it.
There is an argument, oft repeated, that women should be able to walk around wearing whatever they like and not have to endure comments. I don't agree with that argument in exactly the same way as I don't agree with the argument, if there is one (but I've never heard it), that men should be able to walk around wearing whatever they like and not have their appearance commented upon.
Planting himself in her path was a step too far beyond what I'm going to call civilised sexual signalling, but wolf whistling is not. And that's the issue people disagree over, and probably always will. We are sexual animals and wolf whistling, like hair beautification and make-up and clothes fashion, is a harmless, if annoying to some people, sexual signal.