The message that I get from a person who is cussing is that he is too angry to be thinking straight.  Why would anyone heed the words of someone who isn’t thinking straight?

No matter how much someone irritates me, if I want my ideas to be understood, I need to choose words that will build a bridge connecting that person to me.  If I sound like a thoughtful friend, he will listen and consider what I have to say (unless he is too angry to be thinking straight).