Arnold Shwarzenegger had a super motivating post on reddit(spits) to a guy who felt similar to this fellow.

I lift. I’ve lifted for years. Then I stopped Then I got really fat. I KNEW what it was going to take. 5+ years later. 100lbs body fat lost and 18lbs of muscle added later (no juice) and I’m older, but ripped. All I can think when I see people running, lifting, walking, whatever - with that ‘look’ like you know they are just trying to shed that that fat jacket - is “Come on! You can do this!” I know the discipline that takes! Young, mouthy douchebags at the gym with raging metabolisms that keep them cut, even after eating garbage all week, are just the next group of fat, old people trying to stay healthy and happy.

I helped a guy at the gym get into a solid 5x5 routine once, barely thought about it. Just a regular to chat to sometimes. You could have used this guy to clean a chimney. He got ripped up. Not bulk, but shredded and built it turns out. Few years later, at a different gym now, a guy comes up to me (him - I’d forgotten his face) and tells me what a difference it made for him and how him and 3 buddies all took what I showed him and were all still lifting. Thanked me, told me what a difference my advice made (diet too). Frankly, it was the BEST motherfucking day I ever had at the gym! I felt like my hero, Arnold.

Making fun of others at a gym is Imo, grounds for getting tossed out. Snickering included. Funny how they don’t seem to last at the gym anyway…