What is the nerdiest kind of nerd: bookworms, RPGers, or card players?

In my opinion, it's more "nerdy" to involve yourself heavily in RPG games. But any insular activity undertaken to excess is probably a bad idea.

Though I am both a bookworm and an RPGer, I'd have to say that getting deeply involved in an RPG is the most nerdy.

Bookworm types. The rest are technically "geeks" not nerds. But it's very possible to be both...there is a lot of overlap.

The nerd who knows anything about everything, and constantly calls people out on their incorrectness.

I would say the card and board game players...