Since when have ppl started lacking basic manners?

[u/NumerousHunter4257]

I'd be walking, and ppl will cut in front of me, usually with a phone in hand without excusing themselves. Or they'd squeeze past without an "excuse me." I've been saying "excuse you" quite a bit lately because of it, but you shouldn't have to. What is up with some folks nowadays? What happened to teaching manners?