People make offensive or disturbing jokes all the time. If you're truly so sensitive that it "really concerns" you, remember that these are strangers on the internet that will only ever have as big an impact on your life as you allow them to. If a community is full of edgy humor you don't like, leave it and find another one.

I'm not saying that to try to call you overly sensitive or anything; there are plenty of topics I wouldn't want to see jokes about either. The beauty of the entire fediverse community model is that you can go wherever people are that share your values and general vibe.