Knew it. Like hell would Ban ever, EVER say those hurtful things. Ban would cut her own tongue off with a rusty knife than to say those things.
Overall, it's clear that the girl that is trying to be Ban's friend is the actual culprit. She's doing everything that Dan-I was ever accused of. Using Ban to get close to the Four Heavenly Kings, but she needs to isolate Dan-I and also make the rest of the school support her as Ban's friend.