Get this myth out of your head.
This is really bad in low elo.....its like a built in pre excuse incase you lose. People have it in their head you need a tanky support.
You dont even need to always have a tank every game and if you do have a tank they can be top, jungle, or mid (galio, chogath, malphite) ...not just support.
So many games in low elo start off bad just because people are tilted and arguing from champ select soon as they see the support showing they want to use anything other than a tank. And the person who wanted the support to be a tank is just waiting for something bad to happen so they can start their flame.