Civil discord is not just a modern problem. Neither is interpersonal conflict. There have always been those who are too pushy and obnoxious, and there have always been those who teach us how to communicate more effectively and respectfully.
The French philosopher Blaise Pascal provided us with some timeless tips that are as relevant today as they were 350 years ago.
Read his advice, and the corroboration of modern psychologists, in Quartz online journal here: Pascal’s Key to Effective Dialogue