So, yeah... Mr. Interviewer last night said he'd be checking my references "first thing" today. It's now 4PM and nary a peep. (Which I know because I have access to one of the office phone caller ID histories for one of my references and nary a call today. At all.)
So, the lesson here is any interview that starts off with a highly offensive and quite illegal question is one that you should likely just drop an F-bomb and walk away from.
The result would have been the same, but more satisfying.