I used to be very black and white say 35 years ago. I'm 65yo now. In 1987 I attended a therapist for 12 months. He said "Tony, you are a black and white person in a world of 8 billion people all with different shades of grey". I was in quasi law enforcement which meant I went by all the rules, but people arent all so robotic.
So what did people do that made an impact on me more than anything and how did they combat it?
Firstly, these differences can cause ongoing arguments. "Ongoing" because differences are so basic and inflexible. IMO what you need to do is to use your wit and think of very good examples in your delivery of your stance. This along with avoidance might get you by. Another tack is to ask questions, that forces him to explain his black and white stance.
You say "Our child needs feeding"
He says "No he doesnt, remain seated and watch the TV"
You say "Why do you believe he doesnt need a meal?"
Now at this point he might well come up with a surprise answer eg "He might need a meal but for the next 15 minutes I wanted you to watch this show with me". So your question leads to clarification. That avoids conflict and corrects his poor communication.
Using wit can be quick but you need to be a thinker. It also ends with a question- eg
You say "I'd like a rose bush on the balcony, I think I'll buy one"
He says "Dont buy a rose bush they have thorns"
You say "Some dont have thorns"
He says "yes they do just less of them, I hate pruning them"
You say "well that settled that, I'm going to buy a thornless rose bush and prune it myself".
He cant come back at that witty answer as he has stated the boundaries of his dislike for roses and those boundaries only has effect if 1/ they have thorns and 2/ he has to prune it. Here is a thread I wrote on the topic-
The other issue is conflict. I also have a thread on a technique my wife and I use that does work for us.
I hope that helps