In Berwyn IL, you can't mace someone who comes up to your door unless you reasonably believe they are about to harm you. However, the state usually only prosecutes really clear-cut and well-evidenced crimes, and usually not when they're done by fascists. That's why the responding cops just made him return her phone. Fuentes could certainly argue that he was in reasonable fear of harm, and Rose could argue that she was just there for a friendly discussion.