A rational argument is not a stream of assertion after assertion. To prove your case, you need to give reasons. Reasons are, by their nature, two-sided. Your opposition has to grant you those reasons, otherwise they aren’t reasons — they’re just assertions. If your reasons taken altogether support your conclusion, then your argument is valid. And the only way someone can disagree with you is by providing a valid counter-argument. This back and forth is called a dialectic or a discourse. It is found in all disciplines, religious and secular, across all civilizations for all ages of human history.
Except for our age. Our age is the age of Twitter.