A reflection from debates and discussions i have observed and been part of [in real life, lectures, etc]
1. When one debates another, it is naive to think they are merely debating two opposing ideas, to ascertain which one is the more logical one, or the closest to the truth. Rather, you are debating [for all parties involved], years if not decades of mental conditioning and bias, preconceived prejudices, and an emotional attachment to that idea.
2. We each live in a bubble. We love that bubble, and it forms our world view. It gives us comfort to have a set of beliefs by which we understand the world around us. If anyone challenges an idea, or concept we held near and dear, we feel as if they are challenging our own existence, and it scares us.
Therefore, my own personal reflection, it may flawed or otherwise, is to be cognisant of the above. Approach a debate or discussion by points of familiarity first - what you agree upon. Discuss things in a gentle manner. Don't patronise, nor make the other person feel they need to be on the defensive, and reassure them your aim is not to destroy their world, but to show them another view point. Give them the comfort of understanding it will be their own decision ultimately to choose what to believe, and they can examine the other side at their own pace, and at their own will.
As the old saying goes, you catch more flies with honey, than vinegar. This does not mean be deceitfully nice, to trick someone. Rather, it means that people are naturally more receptive if you show them a common sense of humanity, empathy, and respect. They may then consider, even partially, what you have to bring to the table, rather than to ignore it entirely or otherwise, because of an aversion to you.