What is at the core of Dangerfield's anger and bad behavior?

What brings out Dangerfield's anger is his poverty. Dangerfield is from a rich family. He believes, on some level, that he deserves to have life handed to him, just as the man in the shop hands him liquor and ham and chicken based on his accent and the color of his scarf. When life isn't easy and Dangerfield isn't treated as special by the world, his sense of entitlement turns into a vicious, violent anger, which he doesn't hesitate to take out on his wife and baby. Ultimately, Dangerfield is selfish and self-centered.