I often hear people saying phrases of the type "How are we doing over here?" by servers at restaurants, for example. Obviously they mean "How are you (plural) doing?" Where does this type of usage of "we" come from? Is this pronoun misuse a regional thing? Has it entered mainstream American English? Am I wrong in thinking that it is incorrect?
The patronizing "we"
The patronizing we is used sometimes in place of "you" to address a second party, hinting a facetious assurance that the one asked is not alone in his situation, that "I am with you, we are in this together". A doctor may ask a patient: And how are we feeling today? This usage is emotionally non-neutral and usually bears a condescending, ironic, praising, or some other flavor, depending on intonation: "Aren't we looking cute?"