This game's "community" like to troll others by doing things like this, and just want people to be banned for typing words they don't like. The people on this game are just purely against any kind of fun.
Just do what I do when someone bans my champion. has Kat top hovered, ally bans Kat, picks Evelynn and tries your best to win. They get to be mad but you're not trolling, you just picked something off meta and they have to deal with the consequences of banning your champ.
I remember one time a guy banned one of my champions, and I picked something totally off the wall top, like even more crazy than my previous examples, and ended up carrying the game while the guy who banned my champ was salty af. It was so satisfying. He was crying about my pick sooooo much, it was delicious revenge. Then sometimes when they do ban your champ and you pick something super off the wall, they dodge, they get leaverbustered AND you get the chance to play your champion again.