@jholcomb - We are dealing with something similar with a boy in my son's class (they're ten). I knew he had Asperger's, but reading this article actually made me understand better how that's different from autism. Wanting to be included but going about it wrong - that describes this boy perfectly.
My son and I have talked a lot about how to be inclusive with and friendly toward this boy but to still kindly set limits when necessary. (Not every time is a good time to call/come over/etc., for instance.) I've reached out to his parents as well for suggestions about how to handle it.
I'm really proud of my son because there is an urge in children to just reject whoever is different, and he's fighting it hard in his efforts to be friends with this boy.