Similar experience here. I grew up in rural Ireland in the 80s where you said hello to everyone but had a culture shock when I moved to Dublin for college. I quickly realised that you don’t greet everyone. I put it down to a being a matter of scale: in the countryside, it’s easy to say hello to everyone when you’ll usually encounter only a small number of people. It’d be impossible to say hello to everyone in a big city.

I still say hi to people when doing things like hiking a trail that’s off the beaten track: we’re sharing a similar experience and have that one thing in common. If it’s a popular trail or busy weekend, it’s more akin to being in a large town where you don’t say hello.

Another rural-urban division in Ireland is that in the countryside, car drivers greet oncoming drivers – whether they know each other or not – by subtly raising a finger or two while keeping their hands on the steering wheel. Since the 80/90s, this custom has been dying out in the counties near Dublin but I still see it in the West of Ireland. A few years ago, we were holidaying in West Cork and my wife was driving but hadn’t realised we were being greeted by the locals. As a Dubliner, she’d never even heard of this practice.

Edit: By the way, I just noticed your username. Seeing that you’re from Switzerland, I was wondering if it’s a reference to the Celtic Frost album?

    > Probably a rural everywhere thing?

grüezi!