Ralph's attitude is best described as an example of "prejudice".
Prejudice is a full of feeling towards a man or gathering part construct exclusively in light of that individual's gathering participation. The word is frequently used to allude to biased, generally negative, sentiments towards individuals or a man as a result of their sex, sex, convictions, values, social class, age, incapacity, religion, sexuality, race/ethnicity, dialect, nationality, magnificence, occupation, training, guiltiness, don group connection or other individual qualities.