@Knotmyday Ooo, you can actually do the accent marks! Nifty.
As to the question, it’s like toilet and bodily function jokes. Some people never leave middle school when it comes to humor. Filmmakers and TV show producers pander to that demographic, because it makes money. It’s a shame that we as a culture have not evolved beyond making fun of minority groups or genetic medical issues, but it’s the price of a free society.
My idea of excellent low-brow humor recently is a New Zealand horror movie spoof released on video called “Black Sheep.” It pokes fun at all sorts of things: horror movies, genetic engineering, animal activists, sheep stations, Kiwis. And yes, it had sheep flatulence jokes.