What middle-finger wagging??
Her father likes to “scratch” his face with his middle finger during speeches, just as he mentions the name of his political opponent (like Hillary or McCain).
Malia wore her political t-shirt just as brazenly, walking around as she accompanied her father on a diplomatic mission. It’s the in-your-face style of “non-political” politics on her part that I find to be sooffensive.
Does that explain my comment?