Why Greg is angry with his because his father?

Greg is angry with his father because he feels misunderstood and unsupported in his personal interests and choices. His father often dismisses Greg's passions, leading to frustration and a sense of alienation. This conflict highlights the generational gap and differing perspectives between them, causing Greg to feel that his father doesn't respect his individuality. Ultimately, this strain in their relationship stems from a lack of open communication and mutual understanding.