It can also help outsiders to think Australians are friendly when they are called "mate" which they might interperate as "friend". Although the guy in the picture makes it seem like only typical Aussie bogans do this yet lots of people from different nationalities partake in the ANZAC spirit of close mateship that seems trademark Australian.
This also helps to show the typical Aussie bogan which is a real beer drinker or supporter that has the mullet hairstyle and wears flannelette shirts. This is the typical type of bogan depicted by most people in Australian society.
Quickmeme. Australian name calling.