I'm on the fence about this. On the one hand, if someone has to be in a role they can't play, I do prefer them to dodge rather than force me to lose, especially in ranked.
On the other hand, this usually applies when the person in last pick gets the only role they can't play. I expect that once people get to gold, they can float in any role. It's a given, due to pick order, that the players earlier in the draft should be the ones carrying (they got their preferred picks, after all).
If I were you, I would put some effort into understanding the game a little more, to the point that you can play other roles. I used to be super intimidated by top lane, and I still don't know the matchups that well, but I can go there and not feed when I'm last pick. It's just something you ought to be able to do. Again, ESPECIALLY in ranked.
I keep saying, "in ranked" because in normals, just practice something new. It's just for fun. I only take these things very seriously in ranked. I mean, I still do my best to win in normals, but I pick champions that I want to learn, or try to do new matchups. Not sure why you wouldn't want that.