Lots of arguments against what Dutton is trying to do. They all stand on their own merits, so I can see why you don't want to try to rebut any of them.
As I said before, I'm old enough to remember what Australia Day was BEFORE the jingoistic nightmare John Howard turned it into.
I support Australian culture by modelling it with my words and my deeds.
Dressing up in flag apparel does not represent Australian culture.
It is overly nationalistic and done by the types of people who want to claim shared credit for achievements which are not theirs, while looking down on people from other countries they've never met.