Impress & Appall Grandpa in 2 Sentences

Quinn managed to impress & then appall Grandpa in just 2 sentences while we were up in Pretoria...

We were having dinner, and classical music was playing - as is customary in Grandpa's house. Below is an account of the short conversation which followed.

Q, "Is this Beethoven?"
Me, "Yes. Wow! Quinn I am impressed you knew that!"
Granpa gives me an approving "What a good parent you are and look how clever your boys is" look and nod.
Me, "Do you like Beethoven?"
Q, "Nah, it's junk."
Collective gasps all round.
Q goes on, "It's junk because he never sings, he just plays the piano the whole time..."
We all just about died laughing!