Alexia showed this author's message in the book. In the first book, she hangs out with these high-schoolers that are a bad influence on her, drinking and smoking, but in this book, she changes and stops hanging out with them, and chooses better friends. In this scene, she stuck up for her friends when the high-schoolers were teasing them.
Leave her alone! She doesn't have anything to do with that!
Hey, the cops have been snooping around our hang-out, got anything to do with that, losers?