The adjective cultivated is used to describe someone who is polite and civilized. The cultivated people at the party would be very offended by crude behavior.

Someone who's cultivated is knowledgeable or at least familiar with the arts, current events, history. He or she probably has traveled widely, or at least has read about other people and places. In other words, a cultivated person is a citizen of the world. As it applies to farming, cultivated soil is tilled, or churned, to prepare it for planting.

Definitions of cultivated
  1. adjective
    no longer in the natural state; developed by human care and for human use
    cultivated roses”
    cultivated blackberries”
    tame, tamed
    brought from wildness into a domesticated state
  2. adjective
    (of land or fields) prepared for raising crops by plowing or fertilizing
    cultivated land”
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    (of land or fields) not prepared for raising crops
    uncultivable, uncultivatable
    not suitable for cultivation or tilling
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  3. adjective
    marked by refinement in taste and manners
    cultivated speech”
    synonyms: civilised, civilized, cultured, genteel, polite
    (used of persons and their behavior) cultivated and genteel
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