Otaku refers mostly to manga/anime, excluding Nana, which is a cultural icon nowadays. ("You don't read manga? How about Nana? Yay, Nana! Aren't you disappointed that... Wasn't he... etc.")
Err, I don't really see what's so upseting. o___o
Currently in state of increasing stupidity.
I really don't care if the Otakus are like 14 or 20
but seeing 30/40 years old otakus? really makes me laugh and sick at the same time.
^Who are you gonna spank? hmmm