In acting, there was a girl who did not like me because she wanted to date my boyfriend at the time. She would often give me rude remarks and try to embarrass me in front of the teacher.
I decided to just be nice to her, and accept that there was no way for her to get over it. She was student director for one of our skits, and tried to put me down for everything I did, as well as give me an embarrassing costume. I took her criticism and thanked her for it, I informed her that I had a role-specific costume at home that I wore, and was complimented on by the teacher.
I never let her remarks get me down, and I continued to excel in the task I was given despite her trying to discourage me.