The poster's also factually inaccurate. The quote's from Colossians, written sometime in the first or second century CE, not the Bronze Age. It was written by a citizen of the Roman Empire, so the slaves in question could be from anywhere in Europe, northern Africa or the Middle East.
I think it's a little unfair to say that the Bible condones slavery based on one small quote. Plus it was an everyday thing back then, however unpleasant a concept it might seem to us today. I guess it does show that a 2000 year old book shouldn't be the cornerstone of any modern progressive society, but anyone with half a brain should be able to see that (even if many can't!)