Just back from a trip to viet/china. I can say is
Vietnamese drivers give way to each other. Though they use the horn everytime, none of them loses their patience. Even though there are so many bikes, i am surprised the accident rate there is low i heard even though they break traffic rules like beat red light etc. Cars coming usually give way to them. Singapore drivers? Horn them, they point u middle finger. You wanna filter in, they accelerate and speed up instead, making u stuck behind.