The cultural context matters a lot here. What's considered normal or acceptable varies enormously between different regions, generations, and social groups. There's no universal standard on this.

This is one of those topics where there's no single right answer — it depends heavily on your values and circumstances. I'd encourage you to look at it from multiple perspectives before forming a strong opinion.

I think kindness goes a long way here. Whatever the 'right' answer is, you can usually find it by treating people the way you'd want to be treated. That old rule still works better than any complicated theory.

There's a difference between something being rude and something just being different from what you're used to. I try to ask myself that whenever I get annoyed by how other people do things. Usually it's just different, not wrong.

My grandmother always said the more things change, the more they stay the same. Every generation thinks the one after it is going to ruin everything, and somehow the world keeps turning. I try to keep that perspective.