Why do American's like hanging things on trees for the holidays? No, like seriously. Japan does it all year!
Could you explain what you mean? Are you making a joke about Japanese suicide rates?
Let me tell you, they do it because they are cruel and it's fun. Blacks are subhuman anyway.
America has a history of violence against black people that is still in effect to this day. Jokes made about the lynching black victims experienced is derogatory and insulting. If you were to learn the history regarding the violence black people experienced it may open your eyes to how these jokes hurt them.
I'm a minority so it doesn't matter.
Being a minority is irrelevant when you're being racist against other minorities, people will still consider it wrong. You're not supposed to consider any race to be subhuman, or else you'll be thought of as racist.