I was not going to say anything further in this thread, but I would like to clarify part of my original post and make a few comments.
When I used the word "ignorant," I was meaning "discourteous or rude," which is one meaning of the word. I certainly didn't mean that a person who curses is not intelligent.
A few posters have suggested that if I am offended by language, I should step away. This would be hard to do if I am standing in a line to ride and have been there for a while, hearing the person's foul language.
One poster asked how I would warn my DH and SIL. In the past we have not encountered a lot of bad language so if things have gotten worse I simply wanted to let them know what to expect. But from what I read, this is not the case, thankfully. They would not start a confrontation, but they would not be pleased to hear someone calling a lady names. And that issue is what prompted my original question.
Maybe part of this issue is generational. I am a very senior citizen. When I was growing up, cursing was not as prevalent as it is today, especially from women and kids. Obviously times have changed, but I still believe that cursing is unnecessary and impolite. And using the "f" word as one's only adjective is ugly.