I find that sweeping generalities reign supreme. I am not implying that nobody is allowed to joke about it. I am saying that a random poster should not make joking statements about difficult life situations or painful subjects in a mocking way unless it is within a context or part of a specific discussion.
When I am sitting with people who know that I have lost my only two sisters and my parents, and sat shiva four times in six years, I will sometimes make a “joke” about loss, about shiva, about death or mourning. But they know where I am coming from. If I showed up to a new group and started making jokes about death, it could potentially be very painful to someone who has recently suffered a loss, giving the impression that I think it is a light topic.
This is my experience and understanding, others can feel differently. But as someone with a very cynical and sarcastic sense of humor, who has been through my share of traumas, and made my share of jokes, I feel confident making this point.
and mw13 has a point as well.