Swearing

Hi everyone! My 6 year old son is asd, and the past couple of weeks he has started swearing a lot. It was just at home, but ow he does it when we are out. It's mostly directed at me, and he is really horrible. I don't know what to do, I try to stay calm, and I have explained that they are grown up words, but each day is getting worse. Any advice would be greatly received. Thanks