I don't know if it was my luck or some sorta of phenomenon of HK. It happened to me about 6 times when I asked some passers-by about where to catch the bus to XXXX. Six different individuals would either completely ignore me or they kept saying, "I don't know, I don't know!" and then ran away literally. Is it impolite to ask strangers questions in HK? I used both English and Cantonese and still got the same treatment. All they had to say was, "I don't know" but they acted as if I was going to rape them.
Then in the MTR subway, I had two Chinese guys voluntary helped me on two separate occasions by very patiently showing me where and how to transfer routes to reach my destination.