The gentlemen pronounced him to be a fine figure of a man… (Chapter 3)

Darcy danced with Caroline and Louisa and then spent the rest of the evening walking about talking occasionally to one of his own party—Chapter 3. If he was introduced to some of the gentleman of Meryton, which is not, as you point out, excluded in the text and is likely I think—then Darcy is indeed acting very pompous by not ever speaking with any of them again past the introduction phase. I think the scenario you describe is a good explanation for why he acts this way and it is very unfriendly since the gentleman as well as the ladies looked at him with admiration till his behavior turned them against him. I think it is likely the gentlemen would be offended if he never talked to them after he had been introduced to them. ;D