Australians talk a bit about climate change, particularly about taxing carbon.
They also talk about soccer, particularly around the time of the World Cup, and they call it soccer. I’d say most English-speakers-- Canucks, Yanks, Kiwis, Aussies, dunno about South Africans-- call association football soccer. The Australian national team is the Socceroos, not the Footyroos, for instance. Australians who try to get other Australians to refer to soccer as football are seen as dickheads, in my experience.
Disconcertingly, Australians talk a lot about American politics. Often it’s just “why is American politics on the bloody news all the time” but after Obama was elected there was talk about if he’d get assassinated. Often discussions of American politics fall into the topics of “Stupid Yanks”, “Bloody Yanks”, or “The Yanks Are Going To Get Us All Killed”.
Not a lot of talk about guns, true, but the subject will reliably come up whenever there’s a mass shooting in America. Even better, no talk about hunting, a topic much discussed in Michigan and one I disliked.
Even even betterer, you hardly ever run into a holy joe who wishes to share his or her opinions on religion. There’s the occasional street preacher or a Jehovah or Mormon dropping by to give you something to recycle, but really the most common blather on religion comes from the sort of guy (and it’s always a guy) who claims to be “not religious but spiritual”. Other Australians see them, correctly, as dickheads.
Immigration is a fairly big topic, much like in America, which makes me snigger. When Aussies go on about how Indonesians or whoever will take their jerbs I’m tempted to point out how tiny a trickle of illegals Australia gets and how easy it is to keep out boats compared to patrolling the Mexican border.
Personally, as an American, I’m fascinated by the founding generation. They really were quite unusual, much to be admired, and the American Revolution was highly unusual. Naturally, these topics never come up in conversations with Australians, but I don’t remember them coming up much with Americans, either.
Australians service workers do talk about tipping, in my experience mainly how they’d rather get a tip from a customer than a compliment. Can’t have it both ways, dickhead.