We have all known times when we were in a place of business or on a bus, or in a crowd when we were near a person who showed their ignorance by their limited vocabulary. And hopefully we felt a twinge whenever God's name or our Lord's name or title was used in their cussing. It would be a good time here to point out that there is a difference between profanity and vulgarity. Profanity is when we treat God's name, character or person in a disrespectful way. Profanity then, has to do with God and His honor.
Vulgarity is when people talk about inappropriate things.
It is when they refer to bodily functions, sexual intimacy and other crude topics. I hope you can make this distinction in your head. I like to make a point when I am at school. Occasionally I will hear a student use God's name of our Savior's name or ask God to damn something. On these occasions I often remark that I did not know the student was so religious.