i have black people in my family tree they 've been hanging there for years
What do you mean about black people hanging in your family tree?
Just for morbid humour. They're all dead now and won't see me ponder about how I brought them on.
Lynching happened to many innocent black people so joking about it can be hurtful. It would make people think about how much people wanted them to die just based on the color of the skin. You would be scared if people just wanted to lynch you because of the color of your skin.