How does Crooks react to Lennie when he comes to visit?

In Chapter Four, Lennie appears in Crooks' doorway while checking on his pup in the barn. Crooks tells Lennie to go away, but the simple big man cannot understand that he isn't wanted. Crooks at last relents and allows Lennie to sit with him and talk. Lennie tells Crooks "about the rabbits" and Crooks vents about his mistreatment as an African-American. Their conversation takes an unsettling turn as Crooks teases Lennie about his lack of self-reliance; he tauntingly asks Lennie what he would do if George were injured. Unable to think hypothetically, Lennie thinks that George is actually under threat. With some difficulty, Crooks calms Lennie down and takes on a kindlier demeanor. His sour attitude remains, however, as he tells Lennie that his dreams of owning a farm with rabbits is unlikely to amount to anything tangible.