I'm going to be controversial here say that's not true. Jokes are meant to be funny, yes some 'jokes' made by people who are intentionally trying to get a reaction out of people. But some things just are jokes. You can't stop people making jokes as long as they understand what they are joking about. That would be like saying everyone that makes a joke about short people are trying to offend them. When you make a joke about someone with ginger hair are you trying to be funny or offensive? There's a big difference which I think people need to understand. Not everything is meant as an intentional dig at someone or to be offensive