What's the difference between Jamaica and Japan? One has Joint families and the other has nuclear.
Are you making fun of Asians because you think they are inferior to you?
Nope. The difference is one gets hit by a tsunami and the other nukes it
Your joke implies that Jamaicans are all pot heads that smoke all the time and that's not right. Don't make joint jokes about Jamaican culture because you don't want them making fun of yours.