In Of Mice and Men, how does Steinbeck make the way Crooks is treated so disturbing?

Steinbeck makes the way Crooks is treated so disturbing through showing his interaction with Lennie and his desire to join Lennie and George's venture on their own farm in the future. Crooks initially refuses to let Lennie into his room when Lennie visits and later cruelly tricks him into thinking that George will not return to the farm and has abandoned him. Crooks has been excluded from the rest of the men on the farm because of the colour of his skin and turns such disempowerment into a way of being equally cruel to a character even more vulnerable than himself, Lennie, thus giving himself a perverse kind of power and so showing how disturbing the treatment that Crooks has experienced is. Such treatment has embittered Crooks, who is characterised by his loneliness and his desire to belong, shown most explicitly when he asks if he can join George and Lennie on their farm in the future. Despite the fact that Crooks at first rejects Lennie, and then exploits his intellectual weakness, Crooks does in fact want to be accepted by Lennie and George but, as a result of the treatment he has experienced by the other men on the farm, he has learnt to treat others with only spite and rejection. This behaviour is emblematic of the behaviour of the other men on the farm, particularly Curley, as well as the racialised segregation of the US in the 1930s, and so shows how disturbing the treatment of Crooks is.