Although you may not enjoy it, I don't think a passing comment or a wolf whistle from a passing tradesman, can be classed as street harassment. It may seem like harassment from the victim, but harassment has implication of it happening repeatedly, although it may have happen 5 times, the same person may not have done it 5 times.
Street harassment will probably soon by part of the law, to protect girls on the street, but if one comment can be classed as harassment, human interaction in any flirtatious manner will become legal or illegal purely depending on the whether the target enjoy the attentions or not. The difference between harassment and pulling would be a pretty fine line. It devalues the significance of physically imposing harassment or near stalking.
The larger point is objectification, which everyone does. Its natural you use your eyes to see someone until you know them they can be nothing more than an object. I think rather than trying to bury something that is not only natural, and IMO, completely hypocritical to oppose; the emphasis should be on people who still objectify people after meeting them. For girls this idea they are an accessory in the media should be a key point, how often in films, adverts, and such is the girl really no more than just decoration? They often have no character or are only there to make inane comments.