You might as well ask why this world-level swimming coach is acting like an arrogant, aggressive kindergarten aged sod. The answer would be the same. Because building the scenario to make people look down on you in order for the face slapping to feel more effective is in trend right now, no matter how idiotic it makes every one look. To the point where you even forget that you probably shouldn't be boasting about your "weight loss" exercises because of how unscientific it really is, and how that's going to net you a very personal room, with a lot of very nice doctors in it, holding a lot of very sharp scalpels if someone decides to investigate WHY a WORLD level, HIGHLY public figure can loose weight out of nowhere.
Amanto_Kumo