Usage patterns
貧乏人のくせに〈動詞〉even though (he's/she's) a poor person, ~ (used critically)
Even though he's poor, he bought a car.
〈人〉を貧乏人扱いするto treat someone as if they were poor
It's rude to treat him as if he were poor.
金持ちと貧乏人the rich and the poor
The gap between the rich and the poor is widening.