If you give people the opportunity to box you into a revengeful corner, you will truly be boxed into that ugly position for life. ~ Ochuko A.
A revengeful personality is a ugly sight to behold; run far from such and be free. The best way is to act like you never saw the act they put up at anytime. It is definitely not easy to ignore a mean act neither is it easy to ignore the perpetrator, but ignoring wicked or mean acts can be practiced and finally adopted over time.
Remember, the goal is not to ignore the person; the goal is to ignore the acts that are intentionally meant to either make you snap or to ridicule you.
I bet the person trying to hurt you would be so surprised you did not snap, and they will stop, and eventually apologize, especially if they have tried to hurt you several times without success. Get this magic, it works!