Huh.
Manners?
Sorry to feel particularly cynical. I went to seminary school when I was very young; I came to the States at 17, was always amazed at the politeness and kindness of Americans (I was born here but raised abroad), and yet, virtually everything I came to know as a young man has all but disappeared in various neighborhoods I've lived in in California. Most people don't know their neighbors in most places here, a bit different than my time in Illinois or Massachussetts, and people don't seem to agree on most anything these days. Politeness and manners? Only a matter of time before our airports become even more polluted with rudeness, sadly.
This also extends to flying - I've been cut off during final even though they had acknowledged me on the pattern; I've seen countless departures within a mile final with no regard, regardless of whether I was in my 172 or Turbo Mooney. Towered airports bring a modicum of improvement, but even there things get odd at time.
Being parked at the end of a runway troubleshooting a mechanical issue would usually invite other parties to come and lend a hand; these days, talking to strangers without an invitation seems rude to many.
I miss the old days...