Then figure out a way that it won't be combative. Try it out for a couple of weeks and if it doesn't work, then try something else.
I have done some reading on dealing with someone like W yesterday over the internet. The one way that really sticks is to agree with their argument and that will somehow disarms them because they have nothing to go further on.
There are a LOT of ways! You just have to pick one that suits your personality, or one that you think you'll have the most success utilizing, or even one that sounds like a challenge because maybe you love a good challenge.
Here's one: refuse to argue. Set the boundary that you will not argue under ANY circumstances, and when you realize a discussion devolving into an argument, you don't say another word, or you leave the room, or you say "goodbye" and hang up the phone, or you stop texting back.
Just brainstorming...
-PM
M:12y - BD:12/11 - D:6/13 - 4Ds
"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." -MLK Jr.