Recently I've had to delete comments by one of my readers. I don't like doing this, but I have minimum standards for comments: they have to be fact-based, logical, and make sense.
I have no problem with people disagreeing with my posts and explaining why in a comment. I usually rebut it (if I have time) and sometimes these turn into a mini-debate. Fine, but to have an intelligent debate there must be some common ground and some respect for facts.
You might recall a few years ago I had a long debate with commenter, Adspar, who saw things differently than I did but at least we both accepted the same reality, we just disagreed on how those facts affected our future. I agreed with much of what he wrote but not his conclusions. I enjoyed it but at some point we both realized we were at an impasse.
The commenter I recently banned (for the third time I believe) rejects facts and lives in a world where might makes right. If you say it often enough and loud enough it becomes a fact. For example, he recently crowed that Fox News is the most watched cable news network, by far, as though that proved anything. They may be number one because they are smarter and right more often than the others, or they may be number one because they tell angry, bigoted people what they want to hear instead of the truth. Just because more Americans believe God made the world in seven days than believe in evolution, it doesn't make evolution untrue. And because a lot of rich energy companies have spent billions convincing people that people aren't affecting our climate in any negative way, 95+% of the professional climatologists say we are, and dangerously so and all the propaganda in the world won't change their conclusions. Anyone who can't understand and accept these basic concepts should move on, but this individual didn't and insisted that his make-believe world was the reality I must accept. Not in my lifetime. So be it.