You can't counter someone with arguments when they have lost touch with reality. It is a losing proposition no matter what, because you are just losing energy throwing arguments at a literal wall of ignorance.

This sort of trolling (or god forbid actual ignorance) does not deserve a voice anywhere. There are plenty of people with disturbed thinking we don't spend time listening to and we do this because we already know it won't make a lick of difference: At the end of the day, they're still not capable of thinking coherent thoughts no matter how much you talk at them.