Rant away and don't engage! Just because he is speaking (or texting or whatever), does not mean you have to respond. Eventually (and it takes a good long while) he will realize that you don't plan to respond.
My constant response to my XAH is that I will only converse if it's a constructive conversation about our children that requires a response. If not, crickets. He tries to poke me every now and again, but not very often. He has learned LOL.
And......it's given me much more peace that I have ever had.
Big hugs.