Sometimes, I have been called a "Pom" by people who are not particularly well-educated or informed. Nor did I arrive in Australia as a Ten Pound Pom. I am not descended from convicts. Nor have I have ever been a "Prisoner of Mother England".
The fact is no-one really knows how the term POM came to mean English or even British. Even so, it has been a well-known expression for many years, as an article from 1929 reveals.
Yet to say that I am a "Pom" is more revealing of the person using the term, especially as an indication of their prejudices, ignorance and lack of courtesy. I am just as much of an Australian as anyone born here. Why do I know this? Because when I read poetry about an Australian landscape, I know that I am part of that landscape. When I read poetry about an English landscape, it rarely evokes a feeling of home.