Oh I agree that most of the jokes I've ever written are shit and that happens to pretty much everybody all the time but I think it is important that even once I've separate the good, the mediocre and the truely rubbish jokes, keeping a bank of the ideas that I orginally thought made the jokes funny will help me out in the long run.
As for this joke, I've already edited slightly to become:-
(Punchline said with a slightly foolish sense of enlightenment)
"Some claim that yellow is the colour of luck and prosperity.
So that's why it's wrong to refer to the North Korean people as yellow."
xXx