In the eyes of all parents, their own child is always the best. They can scold and discipline their child behind closed doors, but if someone else points a finger and berates their child... even if they outwardly accept it, they will still feel distressed. They might even hold a grudge against you.
Jing Shu wasn't afraid of attracting resentment, but her ultimate purpose in coming here was to resolve the issue of the supplies. If she had followed Li Yuetian's idea to directly lodge a complaint and furiously denounce Wu City's leader, the outcome was predictable. Jing Shu believed that given Jin Tianci's temperament, he would not only make Gold Dominator apologize on the spot but would also likely compel Gold Dominator to apologize to everyone else and return the supplies. And then what?