I've heard this claim. It just doesn't make any sense whatsoever. It's completely and utterly incoherent.
First, the big bang theory really doesn't have much of anything at all to say about the formation of solar systems. The big bang theory is about the behavior of our universe on the largest of scales, beyond a few million light years. A solar system, by contrast, is just light-hours in size (and when we're talking about the parts of it that include Venus and Earth, we're just talking a few light-minutes).
Second, the retrograde rotation of Venus is easily explained by a collision from a large object early in Venus' history.