Off meta = trolling?

Hi, I wanted to ask your opinions about off meta picks. It seems like off meta picks are considered by other players a troll and sometimes can result in a ban: (example: Nunu support with smite). In my opinion, since the current players are meta- slaves (at least in my opinion), there is no place for off meta picks. My question is: Do you think there is a place for off meta picks, or is it something that people should stop doing? (For example, if someone locks in vi support/Nami top, what will be your reaction and will you report him if he lost his lane)
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