It should never be imposed. Let them hug first. Pass the Butter. So you know not to talk with your mouth full. It is appropriate to tell someone that his fly is open.
Tasseled loafers are universally acceptable choices for men's footwear.
Turning your glass upside down is an acceptable way to indicate you don't want more wine. You place your napkin on the chair when finished dining and leaving the table. Climate should be considered when choosing clothing. A host should let a guest go through a revolving door first. It is appropriate to keep a double-breasted jacket open.