I don't know about this level but I have run into a few players lately at 1/2 who will jam a pot preflop with any pocket pair. I guess they hope for a big payday if the pot is multiway and they hit. I have noticed though that they do not typically go nuts postflop unless they do hit. Certainly a continuation bet and maybe a 3bet. Without a read, I would have agreed with others that it was an overplayed overpair and you should have been more aggressive. You gained some valuable info on this guy and lost less than most of us so, well done.