Sentence:  Murrel did not in the least object to being called a monkey, yet he always felt a slight distaste when Julian Archer called him one....It had to do with a fine shade between <WSD>familiarity</WSD> and intimacy which men like Murrel are never ready to disregard, however ready they may be to black their faces. 
Meaning of the word marked with <WSD> tags:  Undue intimacy; inappropriate informality, impertinence.