Banning champs at champ select

Hello, I have a question. I perma ban Yasuo 100% of my games. Some times people pre-pick it so I am in a pickle there and I avoid banning it. Now my problem is that 99% I lose the games that I have yasuo's in my team. Can I still ban or banning it is reportable? How can I get around this thing, since I dont want having Yasuos in my team or the enemy team? Any help appreciated.
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