beats me. the Victoria / New South Wales conflict has never been particularly acrimonious.
@Nikolai_Kingsley something about (shopping) "carts" versus (milk) "crates" maybe?
there might be something in how people from NSW tend to abandon milk crates while people from Vic tend to abandon shopping trolleys, but i've seen both lying around in back alleys in Melbourne, so it might just be a slightly inept meme attempt.
Unstoppable shitposting engine.