You kind of answered the question, with the question. You just separate yourself from the game. If you lose it's not a big deal, if you win it's also not a big

You kind of answered the question, with the question. You just separate yourself from the game. If you lose it's not a big deal, if you win it's also not a big deal. If someone annoys you, just go find another server/game. Basically you do everything to avoid getting emotion. Another option is to find a less intense genre you may like, such as simulation or something less action packed. You can't really be highly invested in a action packed heart pounding game, and look like a bored zombie. Even top tier CS streamers/professional gamers while they may not appear super invested it's mostly because they are not highly invested, they are just playing to practice something/or for entertainment for their viewers. If you watch them at a intense match or tournament you'll see them at their peak intensity.