You shouldn't blame your teammates... but if you do...
Can you at least blame the one that made poor decisions and played the worst all game?
Let me explain for a sec. Post game the enemy jungle blames the 'trash ass' adc for the loss. 'Trash ass' adc had 7/5/8 score. Not a bad score. Not a good score but not bad. Top lane got no blame but had a score 2/11/8 and consistently went in before his team was ready or when he had no support. Constantly split with no wards and was all around having a bad game. Logically, this makes no sense to me. The adc positioned well, for the most part, played behind the front line and was not once caught out alone... so why pin the blame on him?
Again, you really shouldn't whine and blame your teammates. Admitting you were part of the reason you lost will help you greatly. Noticing and correcting your mistakes is a huge part of climbing... but if you find that you absolutely have to blame someone can you at least blame someone that makes sense?