I'm a bronze player with over 200 Ranked games with Vel'Koz support and a winrate of 51 %.
However I have experienced this scenario many times:
I pick Vel'Koz. A teammate bans Vel'Koz because "It's not a support, pick a support *insert cursing and bad language you better not take velkoz or it's troll pick"
This is extremely annoying. So I play Vel'Koz 98% of the time, but they rather want me to play a champion I never play because it fits in their mind of 'a support'...