The terms black comedy or dark comedy have been later derived as alternatives to Breton's term. In black humor, topics and events that are usually regarded as taboo, specifically those related to death, are treated in an unusually humorous or satirical manner while retaining their seriousness; the intent of black comedy, therefore, is often for the audience to experience both laughter and discomfort, sometimes simultaneously. -Wikipedia
I myself have quite a pessimistic outlook on life and I typically lean more towards satyrical and dark humour, since it's something I find myself enjoying more than "-slips on banana peel-" or "Haha, she farted!". I like when comedy gives me something to reflect on after the initial chuckle or laugh or simply makes me genuinely laugh. Comedy like "Mind your language" succeeded quite often, even though it's not dark humour. Franz Kafka's "Metamorphosis" book was and is probably my favourite book to date and yes, it has dark humour.
However, this is beyond my comprehension. Why on earth would you scream "We're all gonna get Ebola!" ? It's not funny, it's not ironic, it's not even chuckle-worthy. There's definitely nothing good to reflect on (other than how and when you might die), neither is there any context right now in which it can be used to generate humour. It's just rather annoying and rude.
Look, I enjoy dark humour that actually can be classified as "humour". Running around shouting things related to the subjects mentioned is probably not even going to get my attention.
Then there is another thing I believe can be added to this:
Do not expect people to enjoy the same thing you do. If somehow you enjoy running around screaming about Ebola, that's fine, I won't chastise you for it if you don't get in my face with it, but don't go around expecting others to enjoy it as well. If anything, you should keep humour that seems or is offensive to yourself. No one should need to tell you to stop doing that, I believe everyone here can tell themselves "This might offend someone, better I keep it to myself."
There's nothing more that I cannot stand than people who act so oblivious; it's practically seeping through their pores that their only intention is to get you angry by making it look like they're allowed everything because they "didn't know".
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At the same time though, most people just don't think about how their jokes can seem hurtful or insensitive to others. There's been many times where I'd crack a joke that was poorly received by my classroom peers in high school.
At that time I'd really sit there dumbfounded as to why they didn't enjoy it whereas I though it was hilarious only a few seconds ago. They may have been sensitive to those things, but I learned to just laugh it off, my way of dealing with negativity was to build up a thick hide, yet I didn't consider that my peers may have been through less or do not handle these things the same way I do. In hindsight, I can now see why.
Some people are blunt. Others that are not, might feel like the blunt people are coming off as rude. It all depends on how and who says it and how it is received. Still, the point stands, everyone should know better than to take a heavy subject and start to make cringe humour on it.