In the current meta a useless ADC or support means the game is lost. If you suck at one of those roles and get autofilled to it, please ask for a swap. There's no harm in trying to set the team up for a better chance to win.
Sidenote: Threatening to troll is not at all the same thing as asking for a swap.
Kazekiba1 votesDid you happen to play a game with a Sion that rushed 
and then random 'tank' items? [sg-kiko] Not trying to name and shame
warpenguin5551 votesNope. I actually hadn't heard about that until now.
Alex h87211 votesI always do this is im autofilled as bot/support. I hate the duo lane the absolute most. Though (at least in norms lately) i've been pulling out pantheon support w/ ignite and winning lanes hard w/ random adcs, but Adc is by far my worst role and I always let someone know this and ask for a switch.