Why do people say that people from the Dominican Republic are self haters ?

I have heard numerous people say that dominican's are self haters because they dont identify with being African American & because they look the same as African Americans lol...just because they look like African Americans doesnt mean they are. I always thought they were biracial-Indian & Carribean not African American can someone clarify this ? I know a couple of Dominican people & that is how they describe themselves as Indian & carribean