Ok, I will ump this:
1. Americans (many, not all) find a bit of bragging and bluster
acceptable, "I'm bigger, I'm better", guns are cool because they inherently intimidate, Donald Trump would be a suitable leader of the free world (WTF?) etc etc
2. Aussies (many, not all) are
averse to bragging and bluster, preferring the subtle approach (thats not a knife.., Tall Poppy Syndrome etc)..
now go have a beer