"They are moderately sickening over the device, I can only imagine the sheer level of their enthusiasm would be intolerable in person." Maleficent wasn't entire sure she would be at all able to tolerate many of them. The point of keeping a low profile, of biding her time, was not to cause disturbances that could be traced to her.
Hexing an incessantly happy person would likely be detrimental to that plan.
"I intend to bring this city to heel, in order to do so I will need to know just whom is running this place, those who hold the fragile little place in its delicate state of peace." Urgh, peace, happiness, contentment, they were a bane. "Sadly my... Temperament is not conducive for such things." Maleficent took offence to everything, her patience with people was largely lacking, "Which poses a problem, wouldn't you say."