While I'm indifferent towards the crazy reaction overall, i think that reactions like these should only be used when appropriate. If it's just as a joke, the it's fine and I don't care. but I think it's inappropriate to use that reaction if the post is sensitive or serious.
However, I don't think replacing it with a dislike button will be any better, especially if the person using it doesn't care enough to elaborate, and it'll probably just lead to pointless drama.