I think that was clear, my further comment was to highlight how far off (maybe), FB's implementation intent has been from the way people are now using it.
Yes, in a joke or funny post the laugh emoji is used as intended. But in a more serious announcement it is the equivalent of mocking disgust, hence more emotionally devastating than a thumbs down.
Eg say someone posts a somber poem about their late father - a laughing emoji is saying "fuck you, I laugh at your pain or your shitty poem or the memory of your dad".
The only question is, why, now that they've seen how it's used don't they let people disallow certain reactions. I'm assuming because emotional distress is more addictive..