Destroy a liberal's argument by exposing the underlying rhetorical cheat.
NO. 2.
Argumentum ad hominem. "Ad homs"—as they're colloquially known—are one of Johnny Libtard's favorite debating weapons, as in Michael Moore's rant: "I would like to apologize for referring to George W. Bush as a deserter. What I meant to say is that George W. Bush is a deserter, an election thief, a drunk driver, a WMD liar, and a functional illiterate. And he poops his pants."

Liberals like ad homs because, unlike you, they have neither logic nor facts on their side and must therefore resort to personal insults which are the last refuge of a scoundrel. Explain this to a liberal friend—and then call him a stupid libtard. When he accuses you of using argumentum ad hominem say: "Hey, I never said ad homs weren't allowed. All I said was that it's kind of tragic when you're so desperate that they're pretty much the only rhetorical weapon you've got."

Psalms 118:8 It is better to trust in the LORD than to put confidence in man.
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Scarlet Chord Ministries   Isa 1:18