No seriously, I really don't mind when people say WE about a NT that isn't their own. Actually, they support it so in a way it is their own team and it sometimes comes automatically to use "we" when talking about that NT. I found myself in situations when I used "we" for Juve and friends laughed at me. To me it was natural to say "we" about Juve, for them it was funny. Similar with the NTs. It comes naturally to use "we" for the NT you support.
But it's, imo, a little strange to talk in the same post about your own country and about Italy, and to use the country code abbreviation for your own country and "we" for Italy.
I know absolutely what you mean. I was in the same situation, getting laughed at because of Juve and "We" and getting the third degree about "what is Juve to you, you're not Italian, you're not from Turin", etc. I can get that as well. I don't know how things turned out that way, but I never enjoyed our leauge to begin with. Out of spite, I support Hajduk just because all my friends are for Dinamo. To me Juve comes naturally.
But for the NT, I think it's absolutely different. NT means National team, your country, your people...clubs are city bound and can have numerous players from all over the world. There's a huge difference. I can relate to someone wishing Azzurri luck, or hoping they do good, but to think of themselves as a part of them, to call them we...is something I can not understand. Ever.
If you're Italian though, your parents born in Italy, but living in Australia is different thing and I believe that is the case when it comes to Salvo.