I just find out where someone stands on an issue even if it's online and just respond accordingly. Most leftists, in fact 99% of them don't even deserve much of a response and really all they deserve is an absolute total all-out rebuke.
I'll usually quote scripture and some of the most harshest ones that are fitting for them and pronounce their judgment that's coming from God and their destiny in the Lake of Fire. If they want to disagree with the scriptures then their fate is sealed even more and their condemnation is just. I put it all on God's opinion and let them fill up their own wrath according to Rom. 1 and elsewhere. I'm done dealing with baby-murdering pro-aborts and their anti-White, Christ-rejecting ways.