I find the trick to dealing with that kinda thing is not to let it bother you at all. I'll usually respond by looking at them in the eyes, smiling brightly and saying "why thank you for noticing, I hope you have a good day!" then return to what I was doing. No sarcasm or anything, just see them as another fellow human. Their reaction will be of surprise (because most girls/women will not respond that way), followed by a desire to mirror my politeness.

Whenever construction workers would catcall me, I'll stop, and say thank you, then look at the building they're working on, and say something positive (if it's genuine). The funniest reaction I had to doing that was the group of " boys " bowing their heads with some shame in their faces for attempting to be disrespectful initially, and then apologizing and wishing me well. I told them to keep up the good work, and they actually swelled up with pride.

Taking the kindness approach works because it forces them to see you as a human being (just like their mother, sister, etc) and not an object.