This guy is very loose/passive. He's your typical calling station/ATM.

So with that in mind, why do you feel a check/raise on the flop is correct against this type of person? What mistakes does this player typically make? Does he bet too often? Or call too often? And knowing his tendencies, what should you do to exploit him?

If you answer those questions, and actually think about the logic behind the correct answers to those questions, you should no longer have much difficulty against these types of players. In truth, loose/passives are like the easiest players to play against. You do a lot of one thing, and little of another, and you are exploiting his tendencies to the max. What are those things?

Answer answering the questions, look back at your hand, and tell us how you should have played it.