Abuse for want of an argument

or ... troll-bane

 “I am enough acquainted with life and the world, to know, that abuse is the evidence of want of argument, and that those who use it, have no right on their side.  There is a dignified calmness in conscious rectitude, which descends not to abuse.  It can reason but it cannot rage.  It cannot quit the strong fortress of rectitude to skirmish in the fields of vulgarity.”
Thomas Paine
Letter to the Citizens of the United States VIII

Antonio Nunziante La stazione di Antibes, il sole