Your mom may feel very strongly that she is right on these issues, and that any debate about them is just silly.
The best way to get her to listen to all that you have to say without interrupting you is to write it all down in a letter and give it to her. You could start it by writing something like "Mom, something has been on my mind and I'd really like to try discussing it with you again. I wanted to approach it with you in a letter because I didn't want it to come across as a confrontation."
You could go on to explain that it's important for you to feel like you've at least been heard. If you wonder why she is so quick to dismiss the issue, or feels so strongly about it, ask her. Hopefully, this will help her to see your viewpoint more objectively, and avoid a confrontation.