Why does crooks think that their dreams is just foolish What changes his mind?

Crooks believes that dreams are foolish because he has experienced the harsh realities of life as a marginalized character in a racially segregated society, leading him to feel isolated and disillusioned about the possibility of achieving those dreams. His cynical outlook changes when he engages in a conversation with Lennie and Candy, who share their aspirations of owning a piece of land and a better future. Their genuine hope and camaraderie momentarily rekindle his own dreams, allowing him to envision a sense of belonging and possibility. However, he ultimately remains skeptical due to the ingrained social barriers and personal disappointments he has faced.