Why Brian so upset about what he saw in the mall?

Brian is upset about what he saw in the mall because he witnessed a confrontation that highlighted the harsh realities of life, such as bullying or social injustice. This experience likely made him feel helpless and frustrated, as he may have empathized with the victim. Additionally, it could have triggered his own insecurities or past experiences, intensifying his emotional response. Overall, the incident struck a chord with him, leaving him feeling disturbed and reflective.