I generally don't get salty about video games*. Games are supposed to be fun, so when I can tell that a game is becoming a little too frustrating, I'll stop playing for a bit. I've never really cared about bad players or teammates, even when they're bad on purpose. But then again, I don't play a lot of multiplayer games where that happens, so :P
RNG is kind of a different story, but I'm still usually good about how I deal with bad RNG. I understand the nature of RNG and I'm always expecting the worst outcomes, so I'm generally happy with my results in things.*
*EXCEPT WHEN IT COMES TO HEARTHSTONE >:(