I worked at a gym for 4 years, and never once saw a fat person getting made fun of for working out. 40 hours per week on the clock, 1-2 hours per day working out, so I was there 50+ hours per week. I could never make fun of them, because I'd get fired. Also, because good for them. Members would never make fun of them, because they're actually doing something about their situation. I've only really seen a couple people "make fun" of fatties at a gym, but they're the douches who make fun of everyone at the gym.