Agree wholeheartedly that "liberalism" is the only political philosophy any sane person could possibly hold.
Fulminate at length against the lunatics who oppose "liberalism": the scroungers, the malcontents, the life-haters, the losers, the crypto-Communists, the eco-fascists. Say: "I'm with you all the way, buddy. The sooner Big Government butts out of our lives, the better we'll all be..."

Quietly enjoy the liberal's growing discomfort as he realizes your views are diametrically opposed to his own. Then say: "Oh. You're that kind of liberal. I thought you meant you were a liberal in its original, true, classic, libertarian sense. Before it got hijacked by the Left..."

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