The rock who folds the flop to your c-bet every single time is giving you a license to steal. Use it - but don't get greedy. The one time he doesn't fold he has the nuts.

Why they do it

Rocks at $1/$2 are predictably foldable until they're not. You can c-bet them off marginal hands all night and it works fine. But when they finally don't fold - check-raise, call-down, lead out - stop everything. That's not a coincidence. That's the hand they've been waiting to play.

The adjustment

C-bet them consistently on appropriate boards. When they push back in any way, hit the brakes immediately. The pattern breaks for a reason.

What it's worth

Stealing from rocks regularly adds consistent low-risk profit. Getting caught once because you ignored the pattern costs you everything you built. Know when to stop.