From Meltzer:
"It appears his role on top will be different from John Cena. Cena would laugh and smile at people who booed him. Reigns is going to be more reactive it seems, including yelling back and swearing at the vocal ringsiders, so long as a camera isn’t there to capture it. His role is now the world champion and he’s not turning heel, but he’s the old-school champion like Dory Funk Jr., Jack Brisco or Lou Thesz in the sense they become heels because they defend against faces with the psychology fans want to see a title change. But they never behaved themselves like heels, and just did a few subtle things in the matches to play that role.
Reigns was mouthing stuff with his back to the camera at some ringside fans when they heckled him saying “I run this bitch.” He did something similar off camera at Mania, as ringsiders were booing him heavily as he was leaving the ring after the show, and he said, “This is my motherf***ing house, bitches.”
Love it, would be even better if they let him do it while on camera too. Definitely the way to go for him.