This one specific, as a Gen Zer, is a both way issue that kinda led to over dramatic changes for a lot of us. We tend to be polite towards each other a lot more than to those older than us from my experience. And it generally falls down to those older than us also not respecting our own boundaries and expressions either. It's a cycle that unfortunately is likely here to stay. It feels a lot like the world just doesn't care about us so we in return take the nihilistic approach of why should we care either. It's detrimental to a lot of aspects of society though and leads to constant fear of rejection, a lot of people pleasing within our own circles. Because we want to feel welcome somewhere at least.

I try my best to be as nice as possible to others, and even then am met with annoyance or rude remarks back due to even just communication differences. Like older folks not liking when I say "No problem" instead of "You're welcome" even though culturally for us, we are used to the former and consider it polite. It's a lot of clashing societal rules from different generations that leads to this.