How can the left excuse Obama's racist pages in his memoirs?

Let me tell you something: the love of my life was black(he is deceased), and we had a boy and a girl: I've seen what these people out there do to those who are not white. Friendships weren't possible. The whites didn't want them because they were black and the blacks didn't want them because they were half white. It is terrible what white people in this country did and still do to their black fellow human beings. As far as I am concerned is it Obama's and every black person's right to be upset about this, and that does not make them racist. A racist by definition will opress you to deprive you of the same rights and benefits they have--and that is illegal in the U.S., even though there are some who still try to practice this, in particular in the deep south.....so no, Obama is not a racist---it is those, who don't want to hear what he has to say about the treatment he got as a black person who are racist....