Jazzyvee:
I'm with Sonicus/Wolf on this one. There is little to be gained from dissing her onstage. But it sure feels great to think about it! Sometimes when I'm really pissed at someone, I'll write a scathing letter, read it back to myself a couple of times, smile, and then throw it away, unsent.
Of course, as an attorney, one reaction I have is sue the bastard, especially if you have the equivalent of small claims court where you can easily sue for a limited amount, (in California it's up to $7500), without getting any lawyers involved. If you do, you could even introduce the band and then just quietly hand her the court Complaint and Summons as you walk off stage. Wouldn't that be fun!
Bill, tgo