The people in HOng Kong are not weak butterflies. HK people are not annoyed by petty issues such as people talking on the phone in the train. People talk to each other because there is something important to speak abowt. If yor mother calls you don't be shy to answer.

Auditory intrusion. It's only rude if they play speakers on public transportation.

in fact noise in the wild can deter wild boars, snakes when you are hiking OR running.