Cause I'm black. They play cards in there but I can't play because I'm black.
Discrimination in Chapter 5 page 98
No I ain't,George says I ain't. I like to pet nice things with my fingers, sof' things.
I think you're nuts.
Discrimination in Chapter 6 page 112
You ain't worth the greased jack-pin to run you into hell.
Lennie had gone into Crooks' room and asked why Crooks wasn't wanted. Crooks is always separated because he is black and has to explain this to Lennie. Crooks is discriminated against by all of the workers because of the color of his skin. He is not welcome around the other men very often.
Curley's wife came in and started talking to Lennie. She eventually called Lennie nuts because he liked touching soft things. It is clear that Lennie is mentally slow yet she says a cruel thing to him. She is discriminating against Lennie by calling him names because of how he acts. A person will discriminate against someone else for any reason, even for something they cannot help.
Lennie was running from the ranch and he began to hallucinate that a rabbit was speaking to him. It was as though Lennie was discriminating against himself because of how his mind functions. The rabbit, speaking as Lennie, was discriminating against Lennie by saying all the things Lennie can't do because of how he acts and by saying cruel things to Lennie. A person can be discriminated against and told how terrible they are so much that they begin to believe it themselves.