For what Elizabeth thinks that she have to live with if she accepted Darcy we´ll have to wait until next week, but here are some clarifications:

According to Darcy, there were two "objections" to Elizabeth's family:
a) their want of connexion and fortune, the fact that one uncle was an attorney and another in trade,
b) the lack of propriety and decorum

In the proposal, Darcy mentions a), not b). Elizabeth thought that those were also the reasons why he separated Bingley and Jane, but he wrote:

"My objections to the marriage were not merely those which I last night acknowledged to have required the utmost force of passion to put aside, in my own case [the inferiority of Eliz. connexions - G]; the want of connexion could not be so great an evil to my friend as to me [possibly because Bingley´s family had made its fortune in trade, and he would be marrying a gentleman's daughter - G]. But there were other causes of repugnance; -- causes which, though still existing, and existing to an equal degree in both instances, I had myself endeavoured to forget, because they were not immediately before me. These causes must be stated, though briefly. The situation of your mother's family, though objectionable, was nothing in comparison of that total want of propriety so frequently, so almost uniformly betrayed by herself, by your three younger sisters, and occasionally even by your father."

IMO Darcy thinks that the lack of propriety of the Bennet family is worse for Bingley than for him because Bingley probably would be living in Netherfield after his marriage, near to Lonbourn, while he and Elizabeth would be in Derbyshire.

So, to sum up, for Darcy:

His marriage with Elizabeth
the lack of connexion and fortune: very bad
the lack of propriety and decorum: less bad

Bingley's marriage with Jane
the lack of connexion and fortune: less bad
the lack of propriety and decorum: very bad

Even if Elizabeth recognizes the lack of propriety of her family, she doesn't accept that they are inferior.