Well there's a contradiction in terms. Perth's National news. No, makes no sense to me.
I can't stand that either. I find it very condescending.
I've lived in WA for 15 years, and 10 of those years in Perth, and I've never heard of anyone think like that. It seems to be just the media. Most people simply don't care where things are produced, with the exception of produce (and even that seems to be slipping).