Make some smart-ass PA after the landing. Here's an example going into say Columbus, Ohio. "Excuse me folks, I know our landing might have been a little hard, but like your Buckeyes, we'll take a touchdown anyway we can get one even if it is a little ugly."
"This is Captain Jim Tressel". Bear with me; I've only been doing this a couple of weeks".
"Next time I won't let the controller (or autopilot) land it." Just say something that will confuse the he11 out of them, so they'll tell their friends and sound really stupid.
Another one, "Was it you that left your cell phone on?"
When flying the RJ with stairs for the passengers to exit down I'd give the offending passenger a little push on the way down and when they fell in a crumpled heap I'd proclaim: "How was your landing? Not so easy is it?"