"I can see, you dumb mosquito! With earthbending," she quipped, frowning. "Or, did you just totally ignore me on the network the other day so you could be a big jerk?!"

You could say... Toph holds grudges. Still, the risk of her stepping on him or losing track of him and hurting him more than she intended is real. As much as she likes to bust up people who have been jerkfaces to her, she doesn't want to maim them.