I don't think his argument was just about Obama's speech or behavior. I think XBGamer is referring to the fact that Obama is not a descendant of black African American slaves, or the American black experience. Obama's father was a black African, not an African American. Obama might have experienced racial prejudice for himself but his ancestors didn't experience slavery, Jim Crow, or the American civil rights movement of the 60's. He didn't have that personal American history experience passed down to him by black American ancestors.
I'm not arguing for or against that point; I'm just trying to explain that point of view.