From Longman Dictionary of Contemporary Englishfamiliarity breeds contemptfamiliarity breeds contemptKNOW somebodyan expression meaning that if you know someone too well, you find out their faults and respect them less → familiarity
Examples from the Corpus
familiarity breeds contempt• Perhaps familiarity breeds contempt - among teachers as well as children.• The first is that familiarity breeds contempt.• The United States has usually been an exception to the rule that familiarity breeds contempt. 