Why do adults say that rock music is discordant?

The perception of music, including rock music, as discordant or not is subjective and can vary among individuals based on personal preferences, cultural conditioning, and musical expertise. While some adults may find certain characteristics of rock music to be discordant, labeling it so in a universal sense oversimplifies the diverse sounds and styles that encompass the genre. It's important to appreciate that music appreciation is influenced by various factors such as taste, familiarity, genre expectations, and individual exposure to different musical forms.