Nowadays, and too often, a joke is used to camouflage anti-group feelings (i.e. prejudice). But the camouflage is itself a neo-diversity problem. Camouflage, you see, does not eliminate the bigotry of the joke. Outward, behavioral (word or deed) expression of anti-group feelings is bigotry. No matter how it is dressed, bigotry is still bigotry.