in that part of the house.

Obviously LC is being exceedingly rude here. In the book, it makes it clear that Mr. Darcy notices her rudeness: "Mr. Darcy looked a little ashamed of his aunt's ill-breeding, and made no answer." In the movie it seemed a little less obvious, but he definitely looks uncomfortable.

Pure speculation: do you think that part of the reason Mr. Darcy eventually came to terms with the idea of having the ill-bred Mrs. Bennet and co. as connections of his own was because, on closer inspection of his own connections he finds that they don't all of them bear up to scrutiny either?

Do you think that his conflict between his feelings for Elizabeth and his distaste for the rude and vulgar Bennets in general led to an increased awareness that rudeness and vulgarity happen even in the best of families?