Not too much of that retarded crap, if you don't mind.
But if we must look at it from that point of view would it be OK if we built our wall around Melbourne? It'll be a lot cheaper than building one right across the country and it'll keep all those Melbournians from infesting the rest of the country.
Sydney and Melbourne are traditional rivals. Of course, we're always right and they're always wrong. Did you realise that "Tasmania" is an aboriginal word meaning "not far enough from Melbourne" and that "Nullarbor" translates as "still not far enough from Melbourne"?
Notice how with all this recent talk about the major Anglophone nations ( UK, Australia, Canada, USA) not one person gives a one iota of recognition to poor o'l New Zealand.