The saying that "sticks and stones can break my bones, but words can never hurt me" is very untrue.
Words have the power to uplift or to pull down. Long after a person has left your life the words that they said will remain with you if they spoke positive, uplifting words but even more so if those words were negative or damaging.
So use your words to speak life into other peoples lives and try to build up not to pull down.