It happens every now and then. We have a tendency to remember the bad ones more than the good ones unfortunately.
You can't control these people. There is no reason to let their behavior affect you beyond the obvious impact on the game. There is CERTAINLY no reason to let it affect you after the game is over. If you think they're feeding, you report them for helping enemy team and bang.
If you're tilted because a particular game stressed you out, take some time off, play an aram, or a bot game, watch a youtube video, jer.. I mean check your e-mail. Whatever you can to get these people off your mind, because they don't really matter. And then queue up again with a positive outlook.