Medium overpair vs. aggression from a passive

Do you think this is mostly monsters? I hate making this fold but I also hate making this call, because experience tells me this is a not very smart guy who thinks he's being smart. No hand history but it went like this:

I am dealt :9d: :9h: in middle position, make a std 3x raise. Loose and fairly passive guy with stats of about 45/15/1.5 calls from the button, everyone else folds.

flop: :7c: :4s: :4h:
I lead for almost the pot, villain thinks a second and calls.

turn: :8s:
I lead for 3/4 pot, villain thinks... thinks... and min-raises.

Effective stacks are 100 BBs - but you don't really have to work the math. We both have enough behind that I can call his turn raise and we both still have more than the pot left.

Definitely mostly monsters. He's almost never bluffing. You have the worst overpair. And the OE straight draw completed. And Baluga Theorem is in effect.

You pretty much hit all my thoughts at the time. I let it go.

is he bad enough to think 2 pr (78) is a monster?