Social Media plays a large part in our lives, allowing us to connect and share with people all over the world. It has also become a major source of stress in the Age of Trump.
Facebook (and Twitter to a degree) are our virtual living rooms. You invite people in to visit, not to argue or cause chaos. You are not obligated to "be nice" to people that come on your Facebook page and cause chaos, the same way you are not obligated to "be nice" to people that come into your living room and cause chaos.