Why I don't use the "declare your pick" feature during champion select

I play mostly {{champion:119}} mid or bot lane and for some reason if I declare him people ask: "draven mid?" and ban him followed with a ":)". This is really frustrating because they are pretty much griefing. It feels dumb to see your own team abusing this pretty neat feature. Nowadays I just remain silent until it's my time to pick and then lock Draven. Has someone else encountered this type of problem or am I the only one?
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