Got banned my champ in champ select

I was going to play a normal, chill game on top. I wanted to play Poppy, so I highlighted her in the select. Then the bad stuff started. Our jungler said that Poppy is a trash champ and if I pick her, we will lose so he banned her. I think it is really unsportsmanlike, as stabbing your teammate like that in their back is a thing that should not have a place in team cooperative game like League of Legends.
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