You’re right. Have always considered Australia the US and NZ Canada.
Americans fit in well in Australia so long as they’re friendly and check their ego at the door. Australian culture is a big moosh of many cultures but tends to cringe at American culture. You kind of have to be more about yourself rather than be all about being an American, then you will fit in.
That’s not really true. Going to specific places for specific things is very different to putting one’s head in the sand. If you make such assumptions about your opposing tribes you’ll continue to increase social division, and that’s the core of this mess.