How do you deal with teamates who ban your own pick?

This has happened to me so many times now, where people on MY OWN TEAM decides to ban my pick just because "it's not meta" or "I don't like this champ" or "hahaha". It's tilting me even worse than when I play and they feed on purpose IN GAME, frustrating as hell to know I'm about to enter a game with kids who will lose on purpose and I find myself quitting queue after queue, losing LP and getting time out all the time. How do you deal with them? Any insight would help (besides not showing who I'm going to pick until after the bans...). Why isn't there a way to report childish acts like this? Why are we, the ones who play by the rules and try to be team like has to suffer??
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