someone who actually knows something about the band besides, the name of the members, american idiot lyrics, and stuff like that.
someone who like them no matter how comercial they are,
someone who can see billie joe's old old photos without saying "yuck!!, omg what an ugly hair!"
someone who know at least 50 songs
someone who .. met them before american idiot,
"kerplunk is a really good record,every green day fan listen to it"