"Being a fan is all about bringing the enthusiasm. It’s being a champion of possibility. It’s believing in someone. And it’s contagious. When you’re around someone who is super excited about something, it washes over you. It feels good. You can’t help but want to bring the enthusiasm, too."
Stands in contrast to the Hemingway quote: "Critics are men who watch a battle from a high place then come down and shoot the survivors."
It feels socially safe, easy, and destructive to be a critic.
I'd rather be a fan.
There are also unhealthy ways of being a fan, for example if you admire someone there's probably someone else you despise. It's much better to follow the title of the post and believe in people in general.
Here's Jeremy Howard explaining why he loves doing everything in notebooks: https://www.youtube.com/watch?v=9Q6sLbz37gk