Certainly the trope is common in fiction. See: The Mentalist (both the protagonist and antagonist share this ability) and several Agatha Christie novels with similar storylines.
This guy sounds like a real-life Red John; able to subtly re-wire people's thinking so that they actually want to do what he suggests.
I have only ever experienced this in the formulaic pattern of dark-arts sales tactics. Israeli companies selling cosmetic products from the Dead Sea are notorious for making a superficial connection with their potential customers and then exploiting that connection for a sale. But those tactics aren't hard to see through and resist. Quite scary to think that someone who has mastered those techniques could actually alter my preferences simply with the power of suggestion.