I think the best course of action is just to ignore him and treat him like any other teacher. Why even dwell or even try to guess why he's blocking anyone or doing other things you find odd? You're the one keeping this situation alive by giving it thought. Some people are strange, just ignore him and move on.

If this becomes a problem with him as your teacher, and by problem I mean you are unable to complete his course work because of his behavior, discuss it with the adults in your life.