Growing up in the States, I was shocked the first time my family took me to China. I distinctly remember the lack of a queue for boarding an airplane (when folks have assigned seats!).
My grand parents explained that it was always first come first served mentality and the older generation still lives that way. When you have a billion plus people, I guess we'd understand. You can see it here in the NYC when trying to get off the subway in Chinatown and the older Chinese pushing before you can get off. They want that seat so move over.
As for the pants, my parents told me that the lack of public toilets and the cost of diapers made it necessary to let kids go when they needed. Forget about disposable ones which we take for granted thanks to pampers.
I'm less concerned with little kids that go in public than folks who let their dogs go where ever they want and don't clean up.