People who are obsessed with sports like to think of themselves as something other than geeky, but the truth is anyone who is obsessed with something to that degree is a geek.
Geeks are proud to be geeky, while sports fans act macho and make fun of geeks even though they also dress up in costumes, cry when their favorite character leaves the show.
They also can't perform any of the feats they see on the screen, even though they really wish they could- just like an anime geek.
If you know a rabid sports fan who is in denial about their geeky nature show them this comic strip by Charles Higson and convince them once and for all there's very little difference between their nerdy passion and yours.
See 6 Reasons Sports Fans And Anime Fans Are The Same Thing here