Soooo. Taking a little looky loo at your post history and unless I misunderstood or you were fibbing before you are 24 years old. Which means you and your fiancee got together at 18 and 16. People who get together so young rarely stay together and that is usually because of the massive amount of development your brains are still going through. Your brain isn't fully developed until around 25 and you aren't a fully formed person at 18.

Aside from that the point still stands that she is being disrespectful towards you. I think it's time for more than a "rule." You need to take a serious look at your relationship and if she is disrespectful and dismissive of you in other parts of your relationship too. Either way it sounds like it's a come to Jesus talk. She needs to know that if she doesn't change this behavior you are thinking of walking away over it.