People have strong opinions, and listening is a lost art. On social media we can see dozens of examples a day of people fighting and trolling someone else because of their opinion. What we lack is respect and curiosity.
When was the last time you asked questions of someone that you disagreed with? Gently asked questions can open minds and hearts. Here are some questions that can help reduce the walls we construct.
Can you share why this is so important to you?
What do you hope will happen if this change happens?
I'd like to learn more, where did you hear this information?
Questions can open discussions, Insight can help reduce distance, but it takes vulnerability and a willingness to really listen. Once you have listened, politeness can help further reduce the risk of escalation of tensions. A simple, "Thank you for sharing. I will think more on this." can help preserve the relationship.
Even when you disagree, you may learn something about a person's values and motives during the discussion. You don't have to convince the person to change. It may be enough to have had a real conversation instead of a superficial one. You may have started a bridge instead of adding another brick to the wall. The Tao says that whenever there is a bitter quarrel, it will go on and on, unless someone decides to end on love. It takes spiritual guts to end on love.
End on love.