Absolutely not Huckleberry Finn. Jim has a terrible nickname, but the whole point is that Huck and Jim become the closest of friends and companions despite Jim being black. It is an *anti-*racist book.
Here’s Twain with his long-time friend John T. Lewis. He said of him, “I have not known an honester man nor a more respect-worthy one.” Lewis apparently inspired Jim in the novel.
Twain (or more properly Clemens) and Lewis grew up together going to the same church in Maryland, which had slaves but also a large free black population, and that church was an abolitionist church and had been since the late 18th century.
But yes, definitely The Merchant of Venice. People think the “hath not a Jew eyes” speech makes up for the rest of the play. Gee, thanks for recognizing Jews as not some sort of other species from you. Very generous, Shakespeare.