A better question is why do fat people and their SJW protectors have no sense of humor? I'm 6ft 170lbs and if my friends played a prank on me where I sat down in some chair that instantly broke, I would get a laugh out of that. I might be slightly embarrassed for a moment but I could stand up, see the humor in it and laugh along with everyone else. I wouldn't get offended or claim that people were "bullying" me because I was the target of a prank.