His character has various layers and character traits that make him real. It's selfish, rude and hypocritical. He is selfish because he prefers wealth to his father, rude because he accuses Grace of being a snob without any evidence, and hypocritical because he is actually a snob. These character traits make him a realistic character. He's not a perfect hero who comes in and saves everyone's day. He is a normal person with positive and negative sides. He is not portrayed as a perfect son or boyfriend because in reality there is no such thing. Every living being has flaws. Like everyone, he has goals for himself. He wants to be part of a higher social class. Nobody is perfect, so that makes it realistic