This is a weird situation, because if he's actually mentioning a racial slur that was used against his people and calling it out AS the racial slur it is, that doesn't seem like the worst thing in the world. These words and slurs existed. It's not like he's trying to use it for fun.
Third-generation Italian American here, and I've certainly heard that one mentioned in passing by my grandparents and great-grandmother (old-school NY Italians) as a term that was directed at them in the Depression era. It's weird to think that Italians spent a good chunk of the 20th century not being considered ethnically white until civil rights happened and then suddenly racist white people were like "ITALIANS AND IRISH, C'MON IN!"