Sidebar: Studies show that when you do that, all you do is push the opposition further away. People who spew putrescence like that in the hopes of swaying people to their view, or somehow thinking this shows they are "right" only shut down open dialogue. Think about that.
Sometimes it may come from someone who you know in real life is actually nice, kind, light-hearted - funny, even! But they choose to use their facebook page to force their volatile views that would never be brought up in dinner-table conversation with friends.
They are your friend.
You don't want to "un-friend" them.
Facebook allows for you to "unfollow" that person.
This is a beautiful tool that I have been using a lot lately. Actually, right now, because I can't afford to be dragged down into the putrid pool of excrement that is every divisive issue, I unfollow as soon as someone shows they're closed-off to open discussion. Here's how:
See a post demonstrating such negativity? Hover your mouse over that person's name.
If you are friends, there should be three tabs:
"friends" "following" "message"
Done! See how easy that was?
You may need to also adjust your notification settings. I had set my notifications to always notify me when people in my "close friends" list posted. Some of these people are recent offenders, so I unfollowed them, but still received notifications due to their placement on this list. I had to change my notifications to no longer see all my "close friends". We'll see how that works, but so far, my facebook is a much more friendly and peaceful place!
Good luck, friends!