According to the textbook, why are personal terms of endearment that people invent in intimate relationships not an element of culture?

Question

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Personal terms of endearment invented in intimate relationships are not considered an element of culture because they are specific to individuals or small groups and are not widely shared or understood across a larger community or society. Culture typically encompasses symbols, practices, values, and norms that are shared broadly within a group or society.

According to the Textbook, Why Are Personal Terms of Endearment