Sportsman and woman cannot run on the sport fields with handkerchiefs, and Boxers spit in a bucket. I do however see where you are going with this. I love Rugby and I do get irritated when players spit on the field, but that is understandable, they cannot excuse themselves quickly and go off.
But for pedestrians to walk around spitting all over the place, sorry there is no excuse. They are just plainly disgusting.