If others talk badly about you, Dont scream with anger and dont have argument with them where it even leads to make us to think what to do something to impress them and talk about us in good way! While doing this they all will laugh at us! Where we are like only one stupid and mental person there! Well these leads to depression!
So there is one solution just "smile" at them with psycho look which make them to think about us what will be next step from him and talk about us everytime! Well this SMILE make them stupid or mental person there and we are like KING there!
Achieve your aim,second!
Live your life in your own way,third!