"Come, Darcy," said he, "I must have you dance. I hate to see you standing about by yourself in this stupid manner. You had much better dance." (Chapter 3)

IMO Darcy can only be judged by his deeds and words. That is my criteria. It seems that just being a gentleman was enough to garner the respect and affability of most the residents of Meryton but Darcy did not think their opinion was worth maintaining. It was Darcy’s first impression to make and he blew it. Darcy tells everyone at the assembly by his manners and words he thinks they are not worth the time of day. What can Bingley’s regard for Darcy possibly do in the face of that? Bingley’s regard cannot gentle Darcy’s opinion of people or how he treats them or make him less of a snob. Bingley, in fact, does not go to the people of Meryton and ask tolerance for his friend because I do not think he believes Darcy acted appropriately at the assembly and it is not his place to do so. Bingley’s goodness and good opinion of his friend cannot save Darcy from the bad opinion of others. People would be magnanimous indeed to continue to curry the favor of Darcy when he so blatantly made it clear their company was beneath him because he is liked by one good man--Bingley who so far has not spoken one word in defense of his friend. Even further than his misdeeds at the assembly, there is no indication so far that Darcy thinks he has done something wrong and I daresay if he did he probably would not want to ride on his friend’s coattails anyway per Chapter 4,—“Bingley was endeared to Darcy by the easiness, openness, and ductility of his temper, though no disposition could offer a greater contrast to his own, and though with his own he never appeared dissatisfied.” I can say if Darcy’s behavior improves then so will my opinion. ;D