Colloquialisms shift with the changes in culture, media, location, and political opinions. "Jerry rig" becomes "jury rig" and the other, Southern US version fades into obscurity because people don't use that word in public anymore (for example). The last time I heard "beat you like a red-headed stepchild" was on an early version of "Buffy the Vampire Slayer" and it was used by a character who would remember it from when it was normal (Lyle Gorch, of the Gorch Brothers... who themselves are a tip of the hat to one of the great film Westerns and one of the great film directors). We don't "lose" a colloquialism; they simply cease to be relevant, much like any piece of popular culture.
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."
Ebony the Black Dragon
http://ebony14.livejournal.com
"Good night, and may the Good Lord take a Viking to you."