"Pom' is a term colonials used to describe the English.
Not all colonials - just Australians, I think.
Certainly as a Brit, I have no problem being called a pommie b*st*rd. It is all part of the banter that goes on between the countries, often dealing with cricket and rugby. After all, it seems to be enshrined in the Australian legal system that every citizen has to spend time at some stage working behind a bar in London.