SAN DIEGO — One day in early March, before he debuted as manager of the San Diego Padres without prior coaching experience, Craig Stammen considered the idea of another first. The former reliever was not all that far removed from a 13-year playing career in which he was never ejected from a game. Soon enough, however, his streak figured to end. Even the most mild-mannered rookie managers know they must, at some point, make a show of defending their players.“I’ve got to put my hand over my mouth as much as I can. Don’t need to get on Jomboy,” Stammen said, referring to the multimedia company that rose to prominence through its breakdown and lip-reading videos. “I think those are my biggest worries, is making it a viral spectacle. So, we’ll see how it goes. You never know. I could lose my cool, just like any of us, and it could go completely wrong.”Wednesday, just three months later, Stammen found himself on Jomboy. Or, to be more precise, in a brief video posted on the company’s widely followed X account.The clip had been lifted from a broadcast of the previous night’s game at Petco Park, where, in the moments after an 11-inning loss to the Cincinnati Reds, Stammen engaged in what he described as a quick exchange with a nearby fan.Before the camera cut away, Stammen could be seen directing a verbal message to the seats above the home dugout as some Padres coaches and players looked on. Not visible in the frame was third baseman Manny Machado, who Stammen said had received the brunt of a spectator’s vitriol.