it means dont let it bother you. like dont worry about it to much because it will ruin the good side of you. like stress or something .
hope this helped
I have had that told to me sooo many times so it basically means that no matter what kind of sh*t people are talking about you or anything else, dont get bothered by it. if you ignore than people will eventually give in and stop bothering you.What's the best username you've ever seen?