This person has already lost and they know it. As soon as someone says "We could get into it, but I don't really want to because I don't actually care that much. After all, I am just a third party observer and don't have any biases." and then continues to post defensively has already decisively lost the argument, because they are already lying to you.

You wouldn't have been summarily executed for not keeping your mouth shut unless the things you were saying were things like what the Nazis were saying, or, you know, actually participating in genocide or acts of war?

Your friend is a loudmouth know-nothing, unfortunately.