In "Old Man's War" by John Scalzi, the narrative touches on a character who is deeply critical of a fellow soldier, Corporal Ruiz. The statement emphasizes the disdain and lack of respect the speaker holds for Ruiz, suggesting that he is a difficult and ungrateful person, even to his own mother. This paints a vivid picture of the interpersonal dynamics within the military setting, where camaraderie is often tested by personal qualities.

This quote not only reflects the speaker's frustration but also highlights the rough, candid nature of military life. The harsh words indicate that Ruiz is not only unappreciative but also incapable of recognizing the sacrifices and effort of others. It serves to underscore themes of loyalty and the complex relationships that develop among individuals in high-pressure situations, such as those experienced by soldiers.