How were Stargirl and Leo at school in chapter 18?

In chapter eighteen of Stargirl by Jerry Spinelli, Stargirl and Leo are in their own world. At school, they are clouded by their love. They seem to only have eyes for each other. However, Leo starts to notice that they really are in their own world, as they are being shunned by the rest of the school. Dori Dilson, a ninth grader, and Leo himself are the only ones who will talk to Stargirl. Everyone else is giving her the silent treatment, which means they are also giving Leo the silent treatment. Kevin explains to Leo that the school is mad at Stargirl for ruining the basketball team's winning streak.
Leo goes from feeling in a "cozy tunnel-of-love" to "chilling isolation." Hillari Kimble gives them a nasty look, while everyone else ignores them in the hallways. This bothers Leo, although Stargirl seems to not notice.