Etiquette requires the presumption of good until the contrary is proved.
Courtesy demands that you, when you are a guest, shall show neither annoyance nor disappointment--no matter what happens.
A little praise is not only merest justice but is beyond the purse of no one.
Manners are a sensitive awareness of the feelings of others.
A gentleman should never take his hat off with a flourish.
Whenever two people come together and their behavior affects one another, you have etiquette.