The Complete Guide to Interpreting Your Dreams

by Stearn Robinson - Tom Corbett
To dream of bad manners, whether your own or those of others, suggests that you are standing in the way of your own progress due to an inferiority complex which you should try to overcome; but a dream featuring overprecise manners indicates that you are contemplating some social climbing which will not work out well—give it up.

Ten Thousand Dream Interpretation

by Gustavus Hindman Miller
To dream of seeing ugly-mannered persons, denotes failure to carry out undertakings through the disagreeableness of a person connected with the affair.

If you meet people with affable manners, you will be pleasantly surprised by affairs of moment with you taking a favorable turn.

New American Dream Dictionary

by Joan Seaman - Tom Philbin
1. If a person is well-mannered, it is a hint that he/she will be easier to deal with.

2. If a person is poorly mannered, they will be difficult to deal with.