Earlier quoted context omitted.
DACH societies are extremely class based, in fact most of European royal families come from there. They take it as a point of honor to be rude or at least gruff in daily interactions, it's not about you. Their cynicism is indeed a poison, no need for it as the real life will bring enough unexpected challenges.
European royal families have pretty much nothing to do with the modern DACH region, and compared to the UK royal families in continental Europe have very little influence. But the rest is pretty much true unfortunately, though I wouldn't call the behavior rude because it's not seen as rudeness by people who do it. It's more that being optimistic, feeling surprised by things, expressing strong emotions is all seen as…
I think the Australian version of naivety is more about meritocratic ideas and flat social hierarchies. Australians aren't usually loud or opinionated. European CEOs may not like it if an employee reaches out to them directly. In Australia, the startup CEO usually tries to be friends with the employees so it feels natural to reach out to the CEO directly and they often reach out to you. In Europe, I get the sense that CEOs believe that they're too important to talk to employees. This has been my experience at startups of similar sizes.