They don’t realize having shitty teammates is part of any game and knowing how to deal with those players is a skill itself.

and nine times out of ten the person in question isn’t at the point where they can start thinking about how to deal with bad players on their team, because they are deeply ignorant of fundamental concepts like map awareness and are a really sloppy player.

idk about Overwatch but in League (at least back when I played) you could get to diamond just by muting your teammates and playing one champion every game and getting good enough to where you didn’t pick bad fights or lose your lane for no reason.