Norks upset by designation as a state sponsor of terrorism
They earned the designation. Using WMD in another country to kill the brother of the current despot in charge in Pyongyang was an attempt to terrorize anyone who might oppose the current leadership. On top of that, they have threatened genocide against the US and its allies through the use of nuclear weapons. Besides the very existence of teh US and South Korea is a provocation to the short fat guy.
North Korea Accuses Trump of a ‘Serious Provocation’
North Korea criticizes President Trump’s re-designation of it as a state sponsor of terrorism and vows to keep up its nuclear and missile programs.