Protocol

Emily Post, Etiquette, 1922.

The “Cut Direct”

For one person to look directly at another and not acknowledge the other’s bow is such a breach of civility that only an unforgivable misdemeanor can warrant the rebuke. Nor without the gravest cause may a lady “cut” a gentleman. But there are no circumstances under which a gentleman may “cut” any woman who, even by courtesy, can be called a lady.

On the other hand, one must not confuse absent-mindedness, or a forgetful memory with an intentional “cut.” Anyone who is preoccupied is apt to pass others without being aware of them, and without the least want of friendly regard. Others who have bad memories forget even those by whom they were much attracted. This does not excuse the bad memory, but it explains the seeming rudeness.

A “cut” is very different. It is a direct stare of blank refusal, and is not only insulting to its victim but embarrassing to every witness. Happily it is practically unknown in polite society.

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Update: It turns out they did shake hands.