Don't let it get you down! I think that we have all flown with the same sort of guy, and you are right, it isn't fun!! Although you say that he is awkward, rather than dangerous, it does become dangerous when an incident occurs!!
Aero_student, would you be willing to PM me and let me know what airline it is that you work for? From the story you are telling, it seems very similar to a couple of other stories and I am curious.
Well done for standing up to him though....!!