I've heard those stories too but I've never seen that happen at my local Planet Fatness. There are plenty of really fit people and some old people maintaining their fitness. I took my SO there but he didn't like it because there weren't enough heavy free weights for him but for me, it's suitable and cheap. Yes, there are a lot of fatties who pay for the  membership but they go maybe once a month and when they do, they're talking on their cellphones and watching other people work out. Sometimes, they might stretch while talking on their cellphones. I've seen one ham watch youtube videos the entire time while laying on it's stomach. Occasionally, I get a judgy look because I'm really tiny but I brush it off and continue with my day.