Disgusting I know, but it has to be brought up. Bad pun intended. The Chinese like to spit. And its hard not to let it affect you.
After the best part of a couple of months amongst them (most of the time fairly intimately), maybe its the sterile air or contagious force of habit, but part of you thinks if you can't beat them, join them. In fact, whuy not go one better and really show them how to spit properly because, especially for people who do so much of it, the peculiar thing is that the Chinese are not actually very good at spitting.
They are world class throat hoickers. Of that there is no doubt. But the actual spitting part is usually a complete anti-climax. Perhaps it is the crowds or the likely proximity of so many other Chinese people, but something seems to hold them back at the critical moment of expulsion. Still it never fails to make me glance around nervously and check that my legs dont have a new coating.