They rarely ever do it matter-of-fact and smugly. They know you'll catch on.

They act confused - thats how they get away with it.

Instead of just manipulating you outright with confidence they will act shocked and confused that you are calling them out on their behavior. They act helpless, like they couldn't possibly know what they are doing. The more shocked and confused they act the more you will doubt yourself for bringing it up. You will start to question if it's even a big deal at all. It's subtle but smart. Be aware of this.