I work in a warehouse, and one of my co-workers, Juan, is actually a very good guy, he likes me and goes out of his way to help me sometimes. But he liked to "bust balls". He's an older puerto-rican guy, and I'm a white guy and he calls me "f#cking gringo" and other racial insults towards whites, or spanish swear words like "pendejo". I can tell he means no real harm and just wants to joke around, but I can never think of any good comebacks or jokes to get him back! I don't want to be racist, but part of me thinks giving back the same racial humor would work? I'm just looking for some more light hearted non offensive, but possibly funny or effective comebacks for this scenario.