Dreaming of impolite people means that you will not be able to successfully complete the task because of the different opinions of the people involved in the matter.
Meeting an amiable person in your dream means that one of your major events will take a gratifying turn, which will make you very surprised.

Interpretation of polite etiquette in ancient books:
If you don't understand etiquette, your family is sick. 'The Duke of Zhou Interprets Dreams'