I just bought the shirt because it looked cool

That's not gatekeeping a hobby, that's fighting Nazis. Now if you say only x can fight Nazis, that's gatekeeping.

If you were a true fan, you'd know it's called Warhammer 40km. 🙄

Those sound a lot like fighting words, poser. You’re starting look an awful lot like Horus, there, Horus, and you wouldn’t like me when you’re Horus.

Gatekeep hobbies so newcomers or casual enjoyers can't enjoy it

One thing leads to another for me. My love of nature and animals extending into trying to do good things, like picking up trash in the ocean when I paddleboard. Or saving a bumblebee's life that accidentally flew into the ocean.

eh, i'm allowed to be hedonistic. improving my community gives me joy, so i do it. not all hedonism is solely self-centered