It's a pain and it is likely to continue being a pain, though perhaps not as much if more is done to challenge the perpetrators. Ask the council to spray "Bag it and bin it" signs on the pavement and/or attach signs to lamp posts etc. Also, ring the enviro line (020 7525 2000) to report it and to ask for the bins to be emptied before they fill up and thereby deter owners from doing the right thing. There will always be rude, inconsiderate people so don't expect the problem to disappear. Instead, ask yourself what you could do to make it better and be content with that.