How to deal with troller

I think everyone has the experience of having a troller in your team. Somes like, support who steal adc farm, weird method that don't work and actually tell in his scoreboard and thousand more in blind pick. Of course, it's hard to surrender because they want to try something new or just want us to suffer. And force you to play with him till the end of the game. And you can't flame him because of some political correctness reason and you don't wanna get banned.

This is how I deal with those people. Just go AFK and let them enjoy the rest of the game themself. The ban system can't tell is he inting or just having a bad game if he didn't do it several games in a row. And either AFK. Or you can mute all, farm and refuse to join team fight until you think you can get benefit from it.

Flaming s-hole will get you banned, but being one will not. If you can't fight them, join them. That's what riot ban system taught me.