I don't really care when people joke about murder. As far as I'm concerned, anyone who destroys the environment deserves to be destroyed themselves. I'm not even joking about this... I despise those who seek to destroy the environment and use it purely to make money.
TBH there's alot of topics whether traditionally insensitive o not that can be used as an inappropriate joke. I think it depends on how the topic is discussed virtually. I mean I dislike alot of forms of racism but I laugh at some jokes like that. Same thing is sexism and other things. I mean for an example I'd laugh at a sexist joke pointed at guys if it was funny and not inappropriate. Rape is arguable. But generally should not be discussed lightly. So I see this topic as a bit of a gray area to be frank.
And just to many stuff to list....Yeah its a joke but did tu know THAT JOKES HURT?! Yeah! It might just be "Oh i'm not acutally saying it im just joking!" Well.....Jokes can be very offensive~!
Anything involving rape, abuse, suicide, self harm, illnesses, disabilities, o any major events o people who have caused a great deal of harm o death (like wars, mass executions, etc.).