The song "Don't Hurt My Little Sister" by The Beach Boys tells the story of a protective older brother who is concerned about his little sister's well-being in a relationship. The lyrics express the brother's frustration with the way his sister is being treated by her partner, urging him to show her love and respect. The brother is upset that his sister is upset and wants her to be treated with kindness and care. He confronts her partner, urging him to apologize for making her cry and to treat her nicely. The brother emphasizes the importance of not hurting his little sister and of showing her love like a big brother would. The song conveys a message of looking out for loved ones and standing up for them when they are being mistreated. It serves as a reminder to treat others with respect and kindness, especially those who are vulnerable or in need of support.