it is better to show that you are the bigger person but it depends how they treat you. "Bad people are often normal people having a bad day. Be nice to them too. :)"
Maybe they are bullied themselves or something is going on at home. So maybe try to be nice because they might be going through some tough stuff and they take out on you. Be the bigger person and show some love :)
much love,
have a good day, also good luck! :)