She was on stage and a female singer (I think it was Linda Ronstadt) said that she was offended by Robin Quivers or ashamed of her or something like that.

And Robin said something to the affect that "I'm ashamed of you after what you did to that Tom Petty song"?

I see a youtube clip but it's from the Jay Leno performance and resulted in an argument and I didn't hear the line.

Ace will know it, I reckon.

I remember that whole mess. Howard and Robin mentioned that Linda Ronstadt performed in Sun City during apartheid. They ripped her a new one.