Yeah. The 13 years I spent in middle management tought me all kinds of great disarming canned responses. "Thanks for the feedback, we'll look into that". "I'll let the guys upstairs know and we'll circle back". That's a fascinating revelation! I'm most grateful for the input".I've been in situations where people told us things like "I liked the Blondie tune" (we did all original music), and have figured out a response that works well for that situation. Though your situation is different, I suggest next time, you try it out:
Her: "This is the wrong music for these people. Everyone hates this music."
You: Thanks!
She may get confused by this, but her showing up to an 80's party, expecting Chopin - she's already confused. Chances are, after your response, she will be taken aback, and pause to collect her thoughts. That's you cue to smile and quickly move away. No matter what her reaction is, it'll probably shorten the exchange, which is good for both you and her - you're not going to ever agree on anything, given her opening salvo, so don't try to engage her further. Be nice, say thanks, and move on.
I have a thousand of them!

