Peter's judgement of Sally and Clarissa

     In Mrs. Dalloway, Peter continuously judges and criticizes Clarissa, from the phrasing she uses to her hosting of frivolous events.

"Heavenly to see you. She must say so!" He folded the paper; pushed it away; nothing would induce him to read it again! To get that letter to him by six o'clock she must have sat down and written it directly he left her; stamped it; sent somebody to the post. It was, as people say, very like her.

He was angry and frustrated at her noble and polite society sensibilities, something that is not reflected when it comes to Sally

She and Peter had settled down together. They were talking: it seemed so familiar--that they should be talking. They would discuss the past. 

And Sally used to be in rags and tatters. She had pawned her grandmother's ring which Marie Antoinette had given her great-grandfather to come to Bourton.

He sees her departure from her longstanding beliefs, her joining of a class that she long scorned as more of a source of nostalgia rather than a betrayal, unlike Clarissa. Whether or not she still holds the beliefs, and scorns pretentious attitudes, she became a bourgeois member of high society. The difference could be a result of Peter's view of their performances and complete submission to what is expected of them, or it could be Peter deeply wanting to despise Clarissa, in order to blunt the blow of her betrayal. Either way, there is a clear difference in how Peter portrays arguably similar instances.