Explain as to why calmly at least. Don't be a dick. Tell them, for example, they aren't first pick, so the OP pick won't go to the enemy team.
Edit: Why am I getting downvoted for making a post about not being a jerk lmao
Kei1431 votesprobably because you've made this post already and this is just spam.
GULAG 4 U1 votesIt isn't the same message? The other one says to not be surprised if your team gets mad when you ban their champ, and this one says to not be a dick when you do it and explain as to why?
redfeenix1 votesOr I just ban whoever I want....
Martensitic1 votesEdit: Why am I getting downvoted for making a post about not being a jerk lmao
YOu are being downvoted because your post is far removed from reality, friend.
There is no friendly explaining such people, tehy will flame, threaten, feed, provoke. The best course of action is to not waste any breath on them in the first place.