I'm gonna say this without knowing all the other cultures out there and their etiquette.
I'll just speak to what I have observed in this society in the USA. Many people here are extremely rude.
Everybody is in a rush. Most people here are just into money and material things. From the drug dealer who wants to make money but
doesn't care how many people he kills. To the corporate business man who steals and cheats his way to the top.
To all the corrupt politicians who , if they did the right thing , could solve many a problem. Etiquette ?
That book got thrown out the window many years ago.