That falsification, defined as the giving of respect no matter what the quality of the action being witnessed is, is defined as tact, while etiquette is defined as purposeful inattention so as not to notice the private affairs of others.  
One section of this book describes a moment where the "structure of social interaction" between two groups of people is "suddenly and poignantly laid bare" because one of them knows that the other group knows that the other group knows that the other group is just faking their appreciation.  That falsification, defined as the giving of respect no matter what the quality of the action being witnessed is, is defined as tact, while etiquette is defined as purposeful inattention so as not to notice the private affairs of others.  It uses the examples of a restaurant kitchen and a teachers' lounge as (*) "backstage" areas where, though the person themselves is the same, the audience is not, and they may wish to take on a different role.  Postulating performance as the solution to interaction by comparing life to the theater in an extended metaphor, for 10 points, name this work of Erving Goffman.
One section of this book describes a moment where the "structure of social interaction" between two groups of people is "suddenly and poignantly laid bare" because one of them knows that the other group knows that the other group knows that the other group is just faking their appreciation.  
{Presentation of Self in Everyday Life}