Don't ban champions that have been picked by your team in ranked because you think they'll feed!

My story: I get into champ select, I was first pick top. I type in the chat "don't ban pls" (90% of the time I only play these 2 in ranked). Unfortunately, was banned from the enemy team. So that leaves me with . We get to the second ban of my team and my teammate bans him. After asking him why he did that, he responded "You will feed with him" (similar, but not the exact words). We start picking and I panic-picked , since he is the next champion I'm most familiar with. I informed my team that I was not good with him and that top will most likely be lost. I get no response. We lost of course and I got flamed by my team both during the game and in the post game chat, saying "cancer top lost the game" and 'you deserve a permaban', when clearly I was not the only reason, since by my 3rd-4th death the game was already lost.

My point:

How can you be so sure I'll feed with my main when you haven't even seen me playing? How do you expect a (semi) one trick pony to perform when you ban his first main? You cripple me, yet you expect me to play like nothing happened. Some people don't play a lot of champs in ranked, some of them might even play one or two, like me. Maybe you should have that in mind next time you start your next ranked game.