I Certainly don't call myself an otaku and would not be happy to be called one. "Wapanese" would piss me off, and if in RL someone calls me weeaboo, i'll chop his/her head off. (yes, with no gender discrimination!)
There are also different branches of otaku which is sometimes important,
Those that I can call from top of head are:
Anime, manga, model freaks, doll collectors, Cosplayers, Datesim/Hgame, doujinshi, Dorama (rare) and fan artists