I think people are getting ruder and more selfish. Parents just give noisy devices and don't care as much. I am also getting older and more crotchety!
My examples usually relate to cinema or theatre, places where it used to be the norm to sit quietly, no devices, respect the show and performers.
I took my dc to the cinema yesterday. Not 'baby friendly' just a normal showing. Toddlers were roaming around, screaming, parents just sat looking at their phones ignoring the kids. One actually got a kids tablet out and put some cartoons on full blast, but then left it playing on the seat while the kid inevitably wandered off up and down the stairs. My kids are now old enough to actively want to watch a film, they don't want to sit for 90 mins of film drowned out by toddler shrieks. 1-2 year olds clearly aren't that bothered and don't have the patience for a 90 min film with a plot. Why did none of those parents just take their kids out, like I did when mine were that age and I realised 'oops they are uninterested, we'll try again when they're older?'
Even when I go to the cinema without kids, there are adults on their phones ignoring the screen, but annoying everyone with stupid phone screens. What's the point? Just stay at home scrolling!
At the theatre people talk, check phones, constantly get up and down returning with drinks throughout performances, then need the loo, then rinse and repeat. These are big shows that have cost £££ to buy tickets for. Why did they bother if they just want to have a chat or get drunk?! Why can't they just wait for the interval?