If you're talking about Limbaugh's "joke," I heard that kind of "humour" when I was in Kindergarten, and even before, I was five years old at the time, and didn't find it very funny. You don't need to insult a person's language or culture to get your point across. I always thought that Limbaugh was juvenile; he just proved it the other day. It also proves that his listeners haven't climbed very high on the intellectual/maturity ladder.
Rush's dismal attempt at "satire" showed nothing more than childishness. Anyone that thought his "joke" was funny needs to compare what they laughed at as children, and what they laugh at now. Generally, people's sense of humour changes as they get older, more educated, and experienced; apparently Limbaugh listeners are stuck where they were at 5 years old.
I believe that's called "mental retardation."