In the US, I've never met one who doesn't enjoy talking about food, especially boba and banh mi.

Beyond that, it just depends on the person...

Talking about the variety of facilities the region has, about traffic, new constructions - anything development related is guaranteed to get the conversation going. There's a lot of rapid urbanization and change going on, and people always have something they want to get off their chest about it.

If you don't mind a bit of griping, politics is not a bad shout either. People aren't hardline attached to one side or the other as much here, and even when they are, they're much more willing to admit corruption at a local city level even if their favourite party is in charge. Complaining about corruption is a common pastime.

Movies and music are also pretty good generic options, as are motorbikes or electric scooters with younger guys in their early-mid twenties.

Having lived in Japan, and spent a fair amount of time in China: food, fashion, music, film, culture and politics (in a polite way), work, among other things

However unless you're planning to visit very rural places I genuinely don't think I've ever met anyone in East Asia talk about cars or hunting. Even in Europe among Millenials or Gen Z I don't know anyone who is into cars at all, a lot of younger people in the larger cities don't even have drivers licenses.

Food of course!