I know you are gathering the interchanges as they occur, but placing Elizabeth's last bit as a list of Darcy's three 'sins' seems misleading enough that I thought I would pitch in what I though Elizabeth meant in overview.

I would say that the three reasons for refusing the proposal are: 1) his proud, repulsive manners (which causes Elizabeth's dislike of his company), 2) his unjustifiable interference in Jane's and Bingley's happiness, and 3) his vicious behavior to Wickham.

I realize these are spread all over the conversation, rather than being collected at the end, but this ordering of them makes more sense to me than grouping Darcy's offenses against Jane and Wickham as one crime, and his rude manners as two. Especially because Elizabeth denies that his ungentlemanly proposal affected her only in that it allowed her to be curt in response. She still would not have accepted him, had he spoken with all the eloquence of Shakespeare and Cyrano de Bergerac rolled into one.