[SampleMan]

What a load. Seriously; something does not alter its classification dependent on its application: it is either Ex Post Facto or it is not.

Applied to the wrong people, any new law becomes ex post facto. That is pretty much the sole definition of ex post facto. If it weren't, new laws could never be made.

Care to try that again?

[OneWingedShark]

Applied to the wrong people, any new law becomes ex post facto.

That's idiotic; Ex Post Facto has a specific meaning:

ex post fac·to
adjective & adverb

with retroactive effect or force.

(Wikipedia)
An ex post facto law (Latin for "from after the action" or "after the facts") is a law that retroactively changes the legal consequences (or status) of actions that were committed, or relationships that existed, before the enactment of the law.

It has nothing to do with the application of the law to particular people.