It didn't seem like a joke. Matter of fact, people who see this thread and just read the "joke" you typed, they would have thought that you either came here to bully or try to start a fight. That is how many people who saw that viewed it as. It just like going up to a kid in a wheel chair and get up in his face to say that he is a burden to everyone else and that he has no value in our society, then telling people later that is was a joke. It just simply watch what you say because you never know who is going to be your next employer, or that person who is your only opportunity to make something out of yourself. I have nothing against kids in wheel chairs. That was just a simile/ example I used to describe the tone you used in that "joke".
