Tell them they're WRONG.
Liberals hate being told they're wrong: a) because the truth is always painful; and b) because in their warped, liberal world, "right" and "wrong" are alien, almost forbidden concepts. That's why liberals prefer terms like "appropriate" and "inappropriate," because they're non-judgmental. So go ahead. Judge them. Because they're WRONG.

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