I had a long-time friend who would do that. Once she posted more than 50 anti-Trump messages in less than 24 hours. Later on, she went on a pro-Palestine kick. I would unfollow her for awhile, then check back in. Finally I told her that not only were some of her posts crossing the line from pro-Palestinian to anti-Semitic, but they were factually wrong (Of course, I was happy to provide the facts.)
She banned me. On FB, banning is the step past unfollowing and unfriending. It’s what you do to stalkers. I can not view her page, if I search for her by name, she doesn’t even show up.
I still have her email address and phone number, but I get the feeling she doesn’t want to hear from me.