That's why I block people who demonstrate that they're either incapable or unwilling to have a good faith discussion.
Of course it raises my blood pressure a bit in the meantime while I convince myself they're not worth my time. Sometimes I'll keep arguing until it reaches a dead end or goes in endless circles, just for the sake of anyone reading the comments. Not everyone has to go that far, of course. It's quite annoying and gives me apoplexy at times.