What I should do when I just wanna flame

I always try to be the "good guy", the guy who supports everyone via chat and backs them up if they aren't doing so good. But sometimes there are just games that you play well, but your team is just awful. They go on to feed the whole game, flame each other and so on. And Me ,as a player, just feel awful about the game and want to go on a flame rant myself. Even tho I never really started flaming at that point, but I have been tempted a couple of times. What should I do in these situations when I play my best but still lose LP even if I played well myself?
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