>>686
It's easy to prove whether someone is a real nerd or not, though.

Find their area of nerdiness then ask them about it. Gamer nerds will not list Super Mario Bros or Call Of Duty as their favourite games, music nerds are not huge into indie pop or post-rock, comic nerds will probably not list a major character as their favourite, but if they do, they will know a hell of a lot about that character.

If someone says their a birdwatcher, then there's not even any need to go into it. You just know.