I tend to ruminate on such things. I have cut-off and ended 'friendships' based on horribly awful beliefs and outbursts. Now, it is perfectly okay to me to have a different political view than my own but; when they espouse hurtful racist, religiously intolerant, rants and hate I cut the ties. I just won't tolerate that. I just had to weed out someone I thought was close to me after they spouted off a similar post to that which bothered you. There is nothing wrong with unfriendng such hurtful people. You don't need them in your life.