Why does Melba feel bad that Thurgood Marshall had to eat at a greasy dive with the students?

Melba feels bad that Thurgood Marshall had to eat at a greasy dive with the students because she recognizes the disparity between his esteemed position as a civil rights leader and the unglamorous setting they found themselves in. She admires his sacrifices and dedication to fighting for equality, which makes her feel that he deserves better than a subpar dining experience. This situation highlights the challenges and uncomfortable realities faced by those advocating for justice, further emphasizing the importance of their struggle.