LEV687 Since we are to love our neighbors as ourselves [this verse], but no more than ourselves, is a person allowed to insult another person on the ground that he himself does not mind if other people insult him?--The Torah refers only to a situation where two people share the same attitude. If the other person feels hurt when he is insulted, you must remember not to insult him.… In a case of this kind, they said, "Ignore your will because of the will of your friend, and your friend's will because of God's Will. But, don't you rely entirely on your own understanding. Sefer Hassidim 349.