er... Souxi.
Bunny's infatuation with Ennis was supposed to reveal her underlying pathetic obsession with a man she could not have, and offer an opportunity for people to see that pathetic obsessiveness may be a symptom of a serious social problem, i.e. alcoholism.
It wasn't for you to fantasize openly about punching her lights out! After all - can anyone really BLAME Bunny for wanting to ride a cowboy?