] ... IMHO I think he is wondering why people would want to meet in this way to dance, dance, dance all night instead of getting together for good conversation which is what he prefers.

Immediately after Darcy thinks this, Sir William comes up to him and starts a conversation. Darcy contributes minimally to this. So, what does Darcy want in the way of a conversation? And with whom would he conduct that conversation? Evidently Sir William's small talk doesn't do the trick.