personal attacks or insults in order to undermine an opponent
https://www.merriam-webster.com/thesaurus/name-calling
or Wikipedia...
Name calling is a form of verbal abuse in which insulting or demeaning labels are directed at an individual or group.
https://en.wikipedia.org/wiki/Name_calling
But I'm sure you recognize that his insults are no substitute for facts or reason in defending one's positions.
You are something of an ally of his, no? You share many/most of his libertarian/anarchistic beliefs don't you?
Why don't you stand in for him in regards to his defense of the men put in cages for "victimless crimes"? Here's a thread you could jump in on & cover for him in his latest cowardly retreat:
http://tigerboard.com/boards/view.php?message=16687667