I pushed back on a friend’s FB post, citing 1-2 facts in my support.  This was a post with 1000’s of responses, so no surprise that a stranger disagrees.  I understand disagreement.  But he starts his rebuttal, “You fool” before citing his facts, facts that I accept as true not too relevant to the argument.  I did not respond.  Such a person is more interested in yelling than in mutual exchange of disagreements.