Besides, etiquette is not so much a manifestation toward others as it is an exponent of ourselves. We are courteous to others, first of all, because such behavior only is consistent with our own claim to be well-bred.
Bearing this in mind we can behave with serenity in the presence of our most aggravating foe; his worst manifestation of himself fails to provoke us to retort in kind. We treat him politely, not because he deserves it, but because we owe it to ourselves to be gentle-mannered.