Nick Jonas. (Photo by Alberto E. Rodriguez/Getty Images) Actor/singer Nick Jonas has slammed bosses at fitness company CrossFit after they posted an “ignorant” joke about diabetes on their Twitter account. Jonas was diagnosed with Type I diabetes at the age of 13, and has been an outspoken advocate for awareness and prevention of the disease. On Tuesday, Jonas took note of a post on the popular company’s Twitter page, which featured a fake ad for Coca-Cola with the made-up slogan ‘Open diabetes.’ An accompanying caption attributed to CrossFit CEO Greg Glassman read: “Make sure you pour some out for your dead homies.'” Jonas took aim at the post and tweeted,
