Respect your teammates...
For a long time many has been frustrating with players on their own team "insta-banning" when the ban phase comes up, and I also know that a lot intentionelly bans champions who other players select.
And please stop the excuses! there is not excuse for sabotaging another players game, banning a champion a team mate has selected is equal to leaving the game or being afk, or intentionelly dying in a game.
If you intentionelly dies in a game you are sabotaging a game, that is not okay, so why should it be okay to ban another players champion?
NOTE: Getting your champion banned from the enemy team is just bad luck But banning a champion selected by your own team is equal to trolling and sabotaging the game for another player, justyfing that is okay, is justyfing that if someone has a bad game it is also okay to just leave the game or afk.