Otaku has multiple meanings. Casual anime fans use this word in the context of being a well established fan who knows much about anime and manga. Japanese see this term as derogitory which represents a person who is a lifeless nerd. Wapanese
see this as derogitory given their strong beilief that because they watched some anime that all the sudden they are japanese.
This is a high-context word, in the american dialect, given the type of people using the word and the context of the discussion this OTAKU could mean expert or geek, complemetary or derogatory.
Larry has a wealth of knowlege about anime, he is a real otaku.