Ban the violators. It would save my space on my "ignore" list. Currently, there is no fear of repercussions.
And he cannot even recognize he is one of the violators. My lord ctc you are dense sometimes.
The words "you are" followed by characterizations of the person you are talking about IS the problem in these discussions. Concentrate on the message being delivered and IGNORE the messenger as a person. You either agree with a message, or disagree with it, or agree/disagree with parts of it.
Discuss that and leave the personality, characteristics, associations, past practices, attitudes, behaviors, likes, dislikes, intelligence, biases, appearance, religion, or anything else about the background of the messenger out of it.
It's about WHAT is being said, not WHO is saying it.
Some may need some practice to alter past approaches to discussion. Others, unfortunately not enough, will not, as they studiously avoid personalities and concentrate on the message.