Apparently the "dad bod" is now a thing, promoted as a cuddly, more realistic male image standard based on chocolate bars as opposed to parallel bars. But you won't see much evidence of that on RJ. I have considered the muscle question myself for twenty plus years.
Particularly as a vertically-limited dude, training with weights was a way of attempting to compensate in my twenties, and a largely effective one too. As I got older, I even began to appreciate the mesomorph advantage for putting on muscle. I came to enjoy the approval, the comments, the touching and the sex that came with a feeling of happiness, strength and confidence. At 5'6", I jacked myself up with much determination to 165 lbs with 6 1/2" wrists -- not normal, and quite time-consuming, lifestyle-limiting and expensive -- without even getting into the stuff that would have put me well beyond the 165.
These are dollars and hours I have spent on my physique and its effect on my sense of self. Truth be told, it has had precious little to do with health, and it would be a stretch to say I did it to help my fellow man. Still, I think the pluses have outweighed the minuses, and believe it is good for a man to put some meat on his bones even if for no other reason than just to enjoy that feeling of being a man.
Contrary to what some others have written, I think it's probably not fair or realistic to expect that you're not supposed to care about how others perceive and react to your looks. People are social, men are mostly visual and this goes double for gay men. And we like to be liked -- it feels nice. Just keep in mind that superficial approval based on appearance isn't worth much. Build the body you want -- for you.
One harsh but true observation: lifting weights doesn't fix ugly -- and that's one thing you definitely don't have to worry about.