The Antisocial Socialist

I am too old to have heard of Warrior Cats

Same. And I don't know many KIDZ.
I do recall Samurai Pizza Cats. I wish I didn't.

And yes. There is smut about the cats

Of course. Rule 34.

Which are your subcultures? Slash/Fanfic and...? Cats?

The funniest thing to me is I recognised Ashley Reese's name.
It took some Googling, but I used to read her at Jezebel.