I have a question about where I came from?

I was born in American. My race is black. My mother is from Haiti, therefore I am Haitian. Why does everyone assume that all Blacks come from Africa? Haiti is an island country that is not located within the continent of Africa. If a person makes a joke about fired chicken, watermelons, grape soda, AIDS, Apes, Gorillas, Baboons, etc, I don' take any offense to that because I am not African. I am Haitian. It is unbelievable that people in this country are that ignorant.