An Australian Xmas

There is a holiday update for tf2, titled an Australian christmas there are new guns hats and a new medieval raid mode which some Aussies are taking offence to. I find it funny, the subtle humour of the creators of tf2 why would they offend us if one of there leading creators is Aussie? The funny thing is I've seen about 4. YouTube videos of randoms talking about this update and,since they're American, the presume it's "historically correct" and the first settlers raided the Australian castles honest to god that's what they've said WTF...