My dad used to say "Sons a' bitches" a lot, and he'd cuss out my mom something awful sometimes, but when she would say "f*ck you!" to him, he knew that she had reached her limit, and he would shut up. My niece never heard my mother say this, and when I told her about this, she cheered for my mom.
Me? I don't cuss much, but I had occasion to cuss today when someone mentioned the word "gossip" and went on about how they had been cussing about someone at work. I HATE gossip, and I wanted to say something nasty, but instead said that I have been the object of gossip several times and it hurts. That opened a few eyes I think. And nothing more was said about the person at that person's job. Who knows, but maybe I will save that person some future grief!