He was just one of those guys that if he didn't agree with you on something, he wouldn't even consider your point of view and he would be hostile towards it.
You couldn't explore the differences in opinion because he just wanted to tell you that you were wrong in a combative manner.
One thing you can do to get a taste of what I mean is check out his twitter and facebook. Particularly on his facebook, it's just non-stop arguments in the comments sections with him involved in most.
I dunno... Maybe he grew up in a household where there was a lot of constant arguing, but he's not someone that is easy to have real conversations with in my experience.
Wish him the best because he has kids to feed, but hopefully he can find some ways to let go of some of that hostility he brings to certain social interactions.
Edit: Just want to explain again that these comments are just based on my experiences with him. It's not like I'm his brother or closest friend. I just know how he was in our interactions.