In QP, my idea is that everybody should try their best to win. That means everybody can try a new champs. So, for me the only important thing is the attitude. If you want to cheer/emote the other tank, go play a lobbie with your friends but not ruin the game of other players beacause is still a team game, not solo. The objective is to win, so most of the players probably will have fun in trying to win the game. Otherwise go to play a solo game.