AT A COMPETITIVE LEVEL...
I get that people really - REALLY - want to read negative shit into literally everything the guy says, but he's clearly not talking about casual gamers with that rant. He plays competitively and at a high tier of play, and you don't get there without being upset if you lose and wanting to get better.
And that goes in all competitive sports - take the NHL, for example, and this guy.
You know what he's doing now? Not playing in the NHL. He never managed to be better than a pretty good backup, but never for long streaks - he wasn't mentally tough enough to battle through real adversity or even just a string of tough luck.
Moneyball had a GREAT example:
If you're ok with losing, you're not going to be one of the best in the world at whatever competitive thing you set you're mind to. In competitive sports - including esports - if you're ok with losing, you're not going to hang at the top levels because that's where the crazy dedicated people are - the Kobe Bryants and Michael Jordans of the world who'll practice in pre-season like it's the final game of the playoffs and who'll do everything they can to win because they cannot stand losing.
Obviously you shouldn't be throwing your controller if you're just sitting on your couch playing CoD in pickup groups, but that's the difference between casual and competitive.
I'm not entirely sure why you're using a scene from a film to illustrate the act of losing in reality.
There are a lot of highly skilled athletes that, no matter their disposition, will never rise above the status of back-up and that will only last a few years at the highest professional level. Succeeding at the level of Michael Jordan or Kobe Bryant is exceedingly rare (and Bryant may or may not have gotten away with raping a woman because of his celebrity status, so there's that, too). There's also a difference between fostering a competitive fire and raging when you lose. Even in a professional competitive environment, it's hard to respect someone that reacts like a petulant twelve-year-old when they get their ass kicked at Call of Duty.