The kind of abuse we suffer every day from passengers doesnīt happen enywhere else, supermarkets, train stations, etc. Itīs only at the airport, and that is a direct consequence of the companies' policy of pretending to provide a privileged service to their loyal customers.
I disagree with your analysis and believe that this type of abuse does happen in the places you describe.
Furthermore, I believe that it is a two way street.
Standards in society have fallen and it manifests itself everywhere.
I have seen very rude passengers, ground staff and crew in the past 5-10 years, behaving in a way that rarely happened 20 years ago.