I've never going to claim there can't be places with traffic as bad or worse than L.A. After all, there's a reason no one in their right mind drives in NYC. Its just usually that when I see what's described as "bad traffic" in some places, its sometimes obvious they don't really know what that means.
(To be fair, sometimes this is also an artifact of just not having to deal with distances where they're from. One thing that Texans and California natives have in common is our sense of distance is much more expansive than someone from, say, Connecticut.)