Diet culture may be harmful to individual dieters, if it leads to comparison and self-loathing. But society also suffers, because a hungry body can’t be as creative.
Likewise, I think it’s wrong to limit yourself to popular and “developmentally appropriate” hobbies, when your real passions might become a great souce of inner strength and a way to build true friendships. But society also suffers, because innovation is the result of diving deeper into an interest than others who came before.
If you’ve been applying a diet mindset to your hobbies, think of this as permission to plan a feast.