I hate to be that person to say it but some do laugh instead of crying at situations that invoke stress or struggle to process death of either a loved one or someone important either to them or others.
I mean, I laughed when I heard about when the voice actress for one of many characters but I only really knew her voice from Danganronpa:Killing Harmony, voicing Kaede.
I didn't laugh at it because I found it funny, I laughed cause of I can't process it mentally and its really just a sensory overload. (It's why I don't go on r/Danganronpa cause not everyone understands that stuff. So...idk. Maybe they are laughing for the same reason. Or they're trying to be a little bitch about it, but...who am I to judge when I annt the most Compassionate of Cultists, also yes. That's a little play on my username and reference to the Green Lantern comics)