I am also a kiwi and we should look at the response in NZ in context of a long history of transgender support.
When I was a child there was a transexual MP who went on to have a long career in politics (and probably still does) So as I grew up, trans stuff seemed really normal.
NZers are also outliers. We have a sense of being apart from the rest of the world and perhaps a little special? We are often first adopters of cultural shifts and like to think we have a laid back approach to most things - especially towards what other people want to do with their lives.
NZ as a culture promotes tolerance.
These are all things I am proud to have as my heritage.
However, when it comes to sport we can lose our perspective. here the sense of tolerance has combined with fervent national sporting pride to become some weird misjudgement.
It's a totally different culture and while that's no excuse - the live and let live aspect has to be acknowledged. It's a win win for NZ - seen to be a tolerant country that welcomes all and also they get a gold medal... all good from their perspective.