Well, thirty years ago I probably wouldn't have said a damn thing.
Twenty years ago, I'd have been very annoyed and would have talked to them after the show.

Ten years ago, I'd have asked them from the stage why they didn't ask first.

Now........I'd just shoot them. Actually, what I'd PROBABLY do now, if I noticed would be to center them out and remind them that it's good manners to ask.....THEN I'd shoot them.

Dan'l Boone