Are you familiar with the culture in a lot of the countries these Asians are coming from? Of course they don't say anything about it. But I've seen enough really over-the-top examples that no amount of silence from them can convince me it just "isn't happening." I also wonder where you're staying. The only place I can think of where you might not experience it is possibly Auckland, the biggest and thus most culturally generic city in NZ. But even her next biggest sibling, Wellington, is pretty bad for it in my experience.