Beyond ridiculous - it is getting dangerous and frightening, and has become a threat to peace. He's such an idiot that he doesn't realize that.
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As Hilary Clinton points out, this matter requires extensive and careful diplomacy. Trump is only escalating the situation. Someone needs to constrain him, for the sake of the world.

Tell me who the enemies are, and I will know who you are.. and the more I note who is Trump’s opposition and who thinks he is an idiot and why, the more I confirm that he brilliant. Not just in his personal life and business, in his two campaign strategies which fooled all and he won against all odds, but in the methods and tactics he is using with countries, entities and opposition.
Tough words towards N. Korean are exactly what’s required on many levels and for several purposes. I’ll skip on historic cultural differences in military and diplomacy tactics and results between Anglo-Saxon/Western world and the “East”.
N. Korea is not self-sufficient at this point to act on the extent of their threats. They have a large arsenal of chemical weapons produced outside of N. Korea, as well as plutonium, missile engines, and other equipment. These production facilities are constantly under surveillance, periodically are being destroyed and shipments to N. Korean intercepted, by entities outside of USA.
Last such chemical plant strike was as recent as few weeks ago. What is said in public and what pre-emptive measures are taking place are two different things.
Hillary Clinton is not capable of anything that does not stuffs her pockets or advances her politically. She is dishonest, corrupt, self-serving and turns on a dime when it suits her. She should be on trial, never mind emails, for Bengazhi lies and cover up with resulted in murders of US Diplomats.
Clintons had the White House for 8 years, and Obama for another 8 years. N. Korean issue was never solved. In 2013 N. Korea openly threatened Japan with a nuclear attack. Japan found the threat substantial enough to active PAC-3 missile interceptor systems.
In 2013 H. Clinton was Minister of Exterior in Obama’s administration. Obviously no results.