Quick fucking hint
If you see a fat person riding a bike, or jogging, or anything to lose weight and you make fun of them for it. Know that people like you are part of the reason they give up and I coringly invite you to
When I still lived with my parents and was in high school I would see the same guy huffing his way down the road. Really big guy, you could tell he was struggling and miserable and losing motivation so I honked at him and yelled something along the lines of “you got this bro don’t give up”. I waved at him, gave him a thumbs up or just grinned at him every school day. By the end of the school year he went from obese to slightly chubby (but still shrinking). I ended up buying him coffee and chatting for a while. He told me that me encouraging him on that first day and acknowledging him every day after had been a factor in his not giving up since his family was pretty unsupportive and thought he would give up quickly.
Encourage people that are trying to change their lives for the better. It doesn’t take much and it might make a difference.