When Dave plows his girlfriend it's fine but when I do it. It's wrong because I used my truck.
Dark jokes are fine at times, but joking about killing people when the world is so volatile is in poor taste.
It's okay because there is a difference. My truck is faster and stronger and on the other hand the girl I fucked was fat.
If you want to make jokes that's one thing, but it sounds like you might want to talk to someone and explain this a little more.