It sounds like the kid just wants someone to talk to him. Have you ever tried holding a conversation with him? Or are you to afraid to, because of what others will think?
He has a friend in the class, one more than I certainly, and thus has a perfectly, friendly, good outlet for anything he needs to say; he just then still feels the need to force himself on other people whom clearly don't want to speak too him. All I want to do is have a conversation with my immediate neighbor and then there's this guy sat behind me going "What'd you say Adam," "What was that?" "Did you say that there?" it's so annoying and I don't like the damned if I do or don't scenario where
I'm the supposed bad-guy here for being incredibly irritated by him or I have to answer him and let him presumably say one stupid comment before he drifts onto something else. ADHD actually sounds like a reasonable prognosis.
I don't want to hold a conversation because I'm not interested in having one, he's already told me what he's doing to his paintball helmet, even though I didn't ask and it's likely he hasn't done - he lies all the time, what bike he's going to get, even though he isn't 17 till next year, and I've already instructed him twice on how to do a Continuity of Ring Final Circuit test.
Trust me, if I could hold a proper conversation with someone I'd get myself some friends first.