Some people call that "professionalism". Behaving and speaking in a certain way so as to grease the wheels of your own success? Who here doesn't do this everyday in your own career? If not, they should start. Amazing how things like being a team player, showing a little humility (even if false), speaking and acting in a certain way, channeling anger and frustration in a productive way, etc, go a long way toward success in any career field. Yes, even doing things like this when you don't feel like it, even when, dare I say, it is "inauthentic".
Djokovic is getting better at this. Unfortunately, his early missteps have been etched in YouTube stone for the world to see forever. Verbally sparing with Andy Roddick in post match interviews, etc. Yes, every athlete feels like that sometimes. But you'll never see Federer or Nadal doing that in front of the public, even though I'm sure, as highly competitive athletes, they have had some outbursts off camera in private. Why? I guess self awareness from an early age. Maybe they were "coached" in this regard. I don't know. But that's how you do it. In tennis and in other fields.