- That's an... awful thing to say to anyone.
- Yes, it is indeed.

9 seconds sound clip from the The Philadelphia Story movie soundboard.

You can hear this line at 00:54:59 in the Blu-ray version of the movie.

Quote context

[...]

- I think a devoted young girl gives a man the illusion that youth is still his.

- Very important, I suppose.

- Oh, very, very. Because without her he might be inclined to go out in search of his youth.

- That's just as important to him as it is to any woman.

- But with a girl of his own, full of warmth for him, full of foolish, unquestioning, uncritical affection...

- None of which I've got.

- None.

- You have a good mind, a pretty face, a disciplined body that does what you tell it.

- You have everything it takes to make a lovely woman except the one essential: an understanding heart. And without that, you might just as well be made of bronze.

- That's an... awful thing to say to anyone.

- Yes, it is indeed.

- So I'm to blame for Tina Mara, am I?

- To a certain extent, I expect you are.

- You coward.

- No. But better that than a prig or a perennial spinster, however many marriages.

- That's too much.

- I'm afraid it's not enough, Margaret. I'm afraid nothing is.

- What... What did you say I was?

- Do you want me to repeat it?

- A prig and a...

[...]