Mr. Gerson you are looking at the world through tinted glasses.  Having lived through the 60's and 70's they were not mannerless as you suggest.  The founding fathers did not focus on a non-hierarchical society, i.e. remember slaves?  

Manners are nice.  Manners are not just about how we behave or where we touch.  Manners also dictate a tolerance of others - even including the Trump - and looking for the good rather than focusing on the bad.

It is the current time that is without manners as they do require respect for others as in their opinions and viewpoints.  Today one must be politically correct and conform to the sanctioned views.  Trump has sacrificed a great deal of personal wealth to show us the hypocrisy we embrace today.