Why can't you give black people watermelon?

Black people have been satirized by watermelon by Americans, so you must never invite black people to eat watermelon, whether in the United States or other countries.

In the long river of history, blacks do have a close relationship with watermelons, and they are even given serious racial discrimination because of watermelons. Although blacks don't have much resistance to watermelons nowadays, in order to reduce misunderstanding, we should not send watermelons to blacks. After all, some historical events cannot be erased.