Fitzgerald is racist?

After reading the African American literary criticism on The Great Gatsby, I've deducted that Fitzgerald is most definitely racist. I hadn't thought too much into it when I first read the novel, because I believed that he portrayed characters like Tom as racists simply to make fun of them and their ideology. But now that I've read the summary, I realize there are many things that went over my head when reading The Great Gatsby. For starters, throughout the novel Fitzgerald uses a wide variety of cultural aspects from the 1920s. He paints a very good picture of the "Jazz Age" and what life was really like back then. For example, there were many instances in the novel in which we could see people rebelling against the law of Prohibition by drinking alcohol and bootlegging. In addition, we see a rise in organized crime and corruption, portrayed by Meyer Wolfsheim. To add on to the big list of significant cultural aspects that Fitzgerald uses in his novel, the economic and emotional effect of World War I is depicted. Also, we see many new fashion trends, including short bobs and more provocative clothes for women and casual attire for men. We get a glimpse into the pop culture of the 20s, including music and dancing; additionally, the most significant craze of that time period is brought to life: automobiles. Finally, the Roaring 20's reputation of living life in the fast lane is definitely represented in the novel. So, if Fitzgerald did that much research and studied so much about New York City in the 20s, why didn't he mention the biggest creators of the Jazz Age, African Americans? And why is it that he never once mentioned Harlem, a place which Nick and his friends have definitely passed through, and where big roaring parties were thrown? In his novel, Fitzgerald made it seem like whites were the only one responsible for creating the Jazz Age and bringing along this brand new epoch of music. The only instance in which the novel mentions blacks at all is when Nick and his buddies see a bunch of uproarious African Americans in a limousine; they're seen as preposterous and over the top, but when Gatsby has his huge parties, he's seen as sophisticated and suave. Fitzgerald erases real African Americans from his novel and replaces them solely with stereotypes.