It doesn't sound foolish to me at all.
2 seconds sound clip from the The Picture of Dorian Gray movie soundboard.
You can hear this line at 00:04:23.745 in the Blu-ray version of the movie.
Quote context
[...]
- If I'm going to keep visiting you, I'll have to send some good sherry.
- Why didn't you intend to tell me his name? I can't explain.
- As I've grown older, I've come to love secrecy.
- I suppose that sounds foolish to you.
- It doesn't sound foolish to me at all.
- Your cynicism is simply a pose.
- Being natural is simply a pose and the most irritating pose I know.
[...]