Is banning because you don't trust your allies acceptable?

Outside of when there is a new champion released, as in that situation, it is obvious that you can't trust your teammates at all that if they pick him, he will probably become a burden for your team. This only applies to ranked, though, On normal games, this doesn't matter because victory is not all that important.

However, what I want to ask is not this. What do you think of banning a champion because you don't want your allies picking that champion?

There was a time, back when was extremely popular, that I would ban him because I didn't trusted my teammates would know the right time to pick him. This happened because there was a game a long time ago that all of my teammates were asking my top laner to pick a tank since the enemy picked Maokai. Despite this, my top laner picked Yasuo. Even though he won early game, we lost because Yasuo was nearly useless post lane phase and didn't had the utility needed to protect our ADC and make us win the game. This happened back during the tank meta. Since that day, I banned Yasuo on almost all my ranked games, because I was afraid that my teammates would pick him even if he was the worst pick possible for that situation. I only stopped doing that recently because Yasuo was nerfed to the point that he is no longer a popular pick nor he is strong.

Is that acceptable, or is that toxic?