It's not difference of opinion that is the problem - it's often quality of argument. Political discussions generally these days are very low quality - not actually trying to work out the best policies that will work best for society. Just posting memes. Little listening. Each side in an echo chamber. People unable to explain why they think things.

Is that wrong? I have virtually no interest in politics. It's unlikely that I'm going to remain friends with anyone who expresses particularly strong political views, left or right. I just don't care, and find it too exhausting to be bothered most of the time. If the only place I see/hear those views is on Facebook, it might be easier to drop Facebook than to drop those friends.