how is crooks' loneliness shown during critical incidents?

Crooks faces loneliness and discrimination, probably more because of his color than because of his past. Here are some quotes that might help:

5) Crooks, on a black man's loneliness: "S'pose you didn't have nobody. S'pose you couldn't go into the bunk house and play rummy 'cause you was black. How'd you like that? S'pose you had to sit out here an' read books. Sure you could play horseshoes till it got dark, but then you got to read books. Books ain't no good. A guy needs somebody-to be near him. A guy goes nuts if he ain't got nobody. Don't make no difference who the guy is, long's he's with you. I tell ya, I tell ya a guy gets too lonely an' he gets sick" (80).

6) Crooks, on George and Lennie's dream: "I seen hunderds of men come by on the road an' on the ranches, with their bindles on their back an' that same damn thing in their heads. Hunderds of them. They come, an' they quit an' go on; an' every damn one of 'em's got a little piece of land in his head. An' never a God damn one of 'em ever gets it. Just like heaven. Everybody wants a little piece of lan'. I read plenty of books out here. Nobody never gets to heaven, and nobody gets no land. It's just in their head. They're all the time talkin' about it, but it's jus' in their head" (81).

7) Crooks, on human rights: Maybe you guys better go. I ain't sure I want you in here no more. A colored man got to have some rights even if he don't like 'em" (90).

Although Crooks is intensely lonely, he is hurt and we feel his pain when Lennie stops by to visit,. Check out these quotes from their meeting,

"You go on get outta my room. I ain’t wanted in the bunk house, and you ain’t wanted in my room."

"S'pose you didn't have nobody. S'pose you couldn't go into the bunk house and play rummy 'cause you was black. How'd you like that?"

"A guy goes nuts if he ain't got nobody. Don't make no difference who the guy is, long's he's with you. I tell ya, I tell ya a guy gets too lonely an' he gets sick."