Simply matching a greeting is a lot of information. It conveys shared context, it conveys an acknowledgement by the party doing the matching that the party doin

Simply matching a greeting is a lot of information. It conveys shared context, it conveys an acknowledgement by the party doing the matching that the party doing the original communication was recognized and understood, it conveys an acceptance by the matcher of the possibility of further interchange, and so on. The fury at this article in the comments is puzzling to me