Personal I'd work up the security(with the ideas people came up with), and ignore him. When he starts to have trouble with it, and he thinks you don't care, he should give up.
If he doesn't go attack his PC, I'm assuming that won't be hard!
Why not become a l33t h4x0r and give him a taste of his own medicine? You could lock him out of his laptop. That will make it harder for him to go sniffing around yours.