I am 100% behind shaclone on his feeding, you dont ban someones pick, without any explanation, and then talk trash to them, then expect good behavior out of them. I mean how do you expect him to play and have fun when he spends forever in que just to have his teammates troll him? instigating should be the most bannable offence.
If people are being terrible you mute them, play out the game, and report them after. If they continue in the post game lobby take a screenshot and send it to Support on the boards via a support ticket.
You then move on with your life and hope you never run into that particular person/people again.
To answer your question simply: You act like an adult.
Who decides when the counter trolling is acceptable. It's a slippery slope.
Retaliation is never a justifiable excuse to behave poorly. While it's not always easy to do, if someone is acting up then just mute, report and move on. Doing that ensures that you don't stoop down to their level like they want you to do.
Intentional Feeding is never acceptable. Intentional Feeding ruins the game for those that weren't doing anything to you, both on your team and on the enemy team. It sucks to play against an intentional feeder, since you don't feel like you're accomplishing anything.
Mute for the toxicity/trash talking. That's why it's there.
You do the exact same thing when a teammate bans your champion as when an enemy picks or bans your champion: You pick a different champion. Yes, it's that simple.
So trolling the rest of your team is acceptable? If you're in ranked, someone is rude, you'd be cool with a teammate throwing your game to punish someone else?
Just mute them and continue. Nothing better than to see them not seeing their messages on your chat screen.
AFKing is the only way. Muting and then carrying them is rewarding them with LP, and intentionally feeding will get you banned.
