The author, performance artist Danny Hoch, recounts his experience taping Seinfeld. (The article is an excerpt from his stage show.) He originally was to play Ramon, the title character of "The Pool Guy," but was fired after one day of shooting because he refused to play the character with a Spanish accent, as Jerry Seinfeld insisted.
. . . when I think about all of my university-trained, fabulously talented, African American, Dominican, Puerto Rican, and Cuban actor friends, and how the only roles they're asked to play are drug addicts, murderers, and idiotic pool cleaners, I think Jerry Seinfeld is, like, the enemy.
The actor who ultimately played the role, Carlos Jacott, did not use a Spanish accent either, but the gag is that when Jerry drops Ramon socially, Ramon accuses Jerry of being classist ("You don't like me because I'm a POOL GUY," or words to that effect) and, I think we are meant to infer, racist. This all seems a bit self-serving, but it's still pretty funny--and I don't think an ethnically typed Ramon would have made it any funnier.
K.