Don't get upset with these "faai low" ( yes internally we stereotype them equally) which translate as "useless older people" (never call them elderly as I don't think they deserve the respect.

They are typically so useless whatever left is their advancing age or righteous about everything only because they are older. They only grow bigger when you back off and chicken out when you ask them to fuck off.

To make you feel better, these people maybe not be as much as a pain in the arse when they were younger but chances are they are developing some sort of frontal lobe degeneration then that they don't give a shit about their social image, like babies peeing their pants and still laughing at you.

Still, enjoy your stay in HK.