When those you're arguing against form their beliefs irrationally and by ignoring data, there is no rational argument you can make, or data you can provide, which will convince them they are wrong. They have faith in their viewpoint, and the facts that disagree with their faith will be discarded.
I'd love to have a polite conversation. By refusing to consider evidence, they are the ones who are refusing to do so. Pointing that irrationality out isn't me behaving badly. It's calling a spade a spade.