That's not a valid comparison.
Just how many homosexual vegetarian wheelchair people are there in the community?
If they comprised of some 10-20% of the population then I would be expecting their media representation too. This a serious topic.
Australian media portrays Australia as having zero minorites. There are heaps of asians in Australia, how come none are represented in the mainstream entertainment media?
Compared with US media you can have a comedy shows based on Italians: 'everybody loves raymond' and 'the sopranos', Jews: 'o.c', Blacks 'my wife and kids' 'cosby show' etc.
Now imagine switching on the tv in Australia and seeing a local show that portray's anything other than an anglo family or anglo setting in home and away, blue heelers etc. It doesn't happen cos the local media are a bunch of racists.