TBH I'm not exactly offended by jokes revolving this, and this is kind of how I am when it comes to many tragedies. Some jokes are better told then others, but I'm assuming for many there wasn't maliciousness intended and they just wante dto lighten the mood/have a different way of responding to tragedy. Not saying people should go out of their way to yuck it up, but that the joking might not always be hateful.
The only thing I'd probably condemn are those that are hating and giving Nintendo s*** over the delay and are completely missing the entire point of the delay.
But I'm also someone who has a pretty dark sense of humor, so I'm maybe not the best to judge...
Regardless, It sucks that Japan is going through so much natural disaster and I hope things work out for them. It's disappointing the direct was delayed but there are obviously much more important things that need to be dealt with now.