I'm somewhere in-between. I'm not an idiot nor a fanatic but I do enjoy watching most sports.
I'm closer to the "fanatic" desription - especially with NFL football (I'm a season ticket holder) and Major League Baseball (I have traveled to ballparks around the US to root for my team on occasion and attend several home games a year when I'm home.)
And I usually end up dating guys who aren't remotely into sports.
Go figure.