While this reaction is definitely understandable, I think along similar lines of some others here that someone that busy just doesn't always have time for a verbose response. "OK" may have been exactly what he had time for, and if that were the case, I'd say his response was likely sent faster than it would have been if someone had asked him an interesting but less urgent message.

Of course, as with everyone else's opinions... this is 100% speculation.

I have the same like-or-hate reaction, though for a different reason: This sort of thing encourages the irrational hero worship that Jobs fostered while he was alive and that's only grown in some circles after his death. Yes, this story shows that he did something good for someone. Once. And I'm sure there are other similar anecdotes. But the takeaway here will not be "this is something that Steve Jobs did that was nice," it will be "OH WOW STEVE JOBS WAS A SAINT."