Why was buck treated so poorly by all these men especially the driver in the red shirt?

Buck was treated poorly by the men, particularly the driver in the red shirt, due to their brutal attitudes toward animals and their belief in dominance over them. The driver, embodying a harsh and callous nature, saw Buck as merely a tool for labor rather than a sentient being deserving of respect. This dehumanization reflects the larger themes of survival and power in a harsh environment, where cruelty often prevails. Buck's mistreatment highlights the struggle for respect and dignity in a world driven by strength and control.