Hero is usually a slight dog to Villain's raising range. A large re-raise isn't attractive because it gets Villain to fold some hands that we would beat, and this makes his range stronger. Calling is a possibility since we don't really expect him to try to bluff us with his one pair hands if the draws come in. I don't mind calling the flop and bet/folding on safe turns. Folding the flop might be better as an exploitative measure.