Kim Jong-un with his little rocket responded by saying "you are a mentally deranged and senile old man".
I don't mean to belittle this spat because it is very dangerous. But it's better to laugh about such things than merely complain or worry. Better yet is to become active and informed in order to remove from power a class of people who mostly depend on violence to bully others into giving them cheap labor, resources, and generally to have their way in the world.