Final answer:
The literary device Fitzgerald is using in this passage is irony.
Step-by-step explanation:
The literary device Fitzgerald is using in this passage is irony. Irony is when the actual meaning of a situation or statement is different from the expected or intended meaning. In this passage, Tom's ideas about race relations are described as 'uncivilized', which is ironic because he believes himself to be civilized. This helps to highlight the hypocrisy and contradiction in Tom's beliefs.